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New 24" Penryn iMac owners....screen bleed fixed???

covertsurfer said:
I just called Applecare and they got me to turn my iMac off unplug it for 20 secs then turn it on whilst pressing Cmd+Alt+P+R and wait for the iMac to chime 3 times and then let go.

My issues now seem to be resolved.

Has anyone tried this before or been recommended to do this?

Update 1 hour later: Maybe not seems to be creeping back.
Click to expand...

ha!... did they also get you to fix your permissions?

-"hi apple care, my iMac is on fire, what do i do?"
-"hi valued customer, please verify and fix your permissions... if that doesn't work you can always reset the pram and the issue should go away"
 
No, I think I will call them and get it replaced. I really dont want to drive to the store I got it from though as its too far really.

Does anyone know if Apple do a courier based swap ie/ he brings a new one and I give him mine?

UPDATE: I've been working on my other machine and now my iMac's gradient seems to have gone again. Is it possible to have an intermittent gradient? I am confused.
 
covertsurfer said:
UPDATE: I've been working on my other machine and now my iMac's gradient seems to have gone again. Is it possible to have an intermittent gradient? I am confused.
Click to expand...

Did you leave the iMac on? It usually gets a bit better after it has warmed up for a while.
 
This reappearing gradient problem is nothing new. If I leave my desk for just a few moments, when I return the gradient is there. Then I have to walk away for another minute or two, and when I return, it's gone.

This is all due to something called Gamma Reflecturization. The reflection values of the operator in the glass screen can cause a buildup of short wavelength re-infalcripated quadcolor shifts, resulting in the screen's hypersenscopic diode being pushed to its native Corfal Point, causing it to ablify, creating a chronophorosophic drag that gives the perceived gradient effect. By walking away from the computer for a few moments, the lack of close reflections rapidly returns the screen to a halovistriotic state, with the gradient affect being reversed by the systemic polarectosity of the glass screen's entomotic prismactomy. You can lessen the affect by wearing darker clothing and a hood while using your iMac.
 
I think I've just realised what its like for someone when I talk to them about programming... That was quite a paragraph and if true seems very odd that the reflection of the user affects the gradient but anything is possible. Thanks
 
Sir Cecil said:
This reappearing gradient problem is nothing new. If I leave my desk for just a few moments, when I return the gradient is there. Then I have to walk away for another minute or two, and when I return, it's gone.

This is all due to something called Gamma Reflecturization. The reflection values of the operator in the glass screen can cause a buildup of short wavelength re-infalcripated quadcolor shifts, resulting in the screen's hypersenscopic diode being pushed to its native Corfal Point, causing it to ablify, creating a chronophorosophic drag that gives the perceived gradient effect. By walking away from the computer for a few moments, the lack of close reflections rapidly returns the screen to a halovistriotic state, with the gradient affect being reversed by the systemic polarectosity of the glass screen's entomotic prismactomy. You can lessen the affect by wearing darker clothing and a hood while using your iMac.
Click to expand...

ohh science... :rolleyes:

i wish the ghetto light leaks and unequal screen backlighting would go away too if i wore dark cloths and used a monitor hood...
 
I have a new Imac 3.06...I don't notice anything wrong with the screens. I am one of the people that bitched and moaned about the uneven screens in the macbook pros a year ago. So there's a gigantic difference between those computers and this computer.
 
I have a 2.8Ghz 24" iMac and it has NO screen bleed and the gradient isn't noticeable. Note that I bought this iMac new as a Build to Order machine. It seems to have been assembled in the US. Maybe this is the difference? I don't know! BTW: This machine was purchase in late March.
 
Sir Cecil said:
This reappearing gradient problem is nothing new. If I leave my desk for just a few moments, when I return the gradient is there. Then I have to walk away for another minute or two, and when I return, it's gone.

This is all due to something called Gamma Reflecturization. The reflection values of the operator in the glass screen can cause a buildup of short wavelength re-infalcripated quadcolor shifts, resulting in the screen's hypersenscopic diode being pushed to its native Corfal Point, causing it to ablify, creating a chronophorosophic drag that gives the perceived gradient effect. By walking away from the computer for a few moments, the lack of close reflections rapidly returns the screen to a halovistriotic state, with the gradient affect being reversed by the systemic polarectosity of the glass screen's entomotic prismactomy. You can lessen the affect by wearing darker clothing and a hood while using your iMac.
Click to expand...

Misspelling a simple word like "effect" sort of ruins the whole bit. :p
 
Sir Cecil said:
This reappearing gradient problem is nothing new. If I leave my desk for just a few moments, when I return the gradient is there. Then I have to walk away for another minute or two, and when I return, it's gone.

This is all due to something called Gamma Reflecturization. The reflection values of the operator in the glass screen can cause a buildup of short wavelength re-infalcripated quadcolor shifts, resulting in the screen's hypersenscopic diode being pushed to its native Corfal Point, causing it to ablify, creating a chronophorosophic drag that gives the perceived gradient effect. By walking away from the computer for a few moments, the lack of close reflections rapidly returns the screen to a halovistriotic state, with the gradient affect being reversed by the systemic polarectosity of the glass screen's entomotic prismactomy. You can lessen the affect by wearing darker clothing and a hood while using your iMac.
Click to expand...

Tried the dark clothing and hood but gradient still there. Then tried putting on a pair of dark sunglasses and the effect dramatically reduced, but was still there. Finally, I tried adjusting the angle between myself and the screen and after few tries - Voila! - No gradient!!! Tried repeating the process several times to see if it would always work and sure enough it works every time. The magic angle seems to be 180 degrees.
 
covertsurfer said:
After keeping my eye on this thread before I bought an iMac I was a bit sceptical however I took the risk and purchased a new 3.06Ghz iMac. It had a stuck pixel which I got replaced.

I have now just turned my replaced iMac on and can see a huge gradient in my opinion. I can't tell whether it is just the light but I don't think it is. What do people think?

I bought it from an Apple Store however its 60 miles away. I bought it on 4th May so I can I call AppleCare and ask for a replacement and for them to collect and replace? I have bought 3 years worth of Applecare. Do I need to wipe my machine before sending it back.

Interested in your thoughts
Click to expand...

Completely unacceptable even on a laptop. But thankfully rare on desktop machines; I don't think I ever saw an iMac in a store like that. Maybe one or two laptops.
 
I'll mention this... I was happy with my new iMac screen, but the need arose to erase/install using the provided discs. However, I noticed two things afterwards – certain software hadn't been installed (Garageband for example), and the screen seemed to me to have a newly-noticed, slight gradient.
I did a second erase/install and everything was fine, with all software installed too. A glutton for punishment, I tried one more erase/install and, once again, some software had not installed and I detected the gradient. It seems that every second install (selecting erase/install) using the discs is not working properly. Again, another install was perfect.
Before posting this, I did another erase install to ensure this observation wasn't pure chance. Sure enough, it did not install Garageband and a couple of other programs, and the screen was definitely slightly lighter on the left. A repeat install again worked fine (all software fully loaded), and the gradient was minimal (if it all), as at the very outset.
Make of this what you will. I guarantee it's as I've reported. With the discs provided with my iMac, it undoubtedly takes TWO installs before everything is done correctly.
Software update confirms this too. With a correct (every other) install, software update will currently present 12 updates. But after each intermediate install, software update will only present 9 updates because three programs don't install.
 
Sir Cecil said:
I'll mention this... I was happy with my new iMac screen, but the need arose to erase/install using the provided discs. However, I noticed two things afterwards – certain software hadn't been installed (Garageband for example), and the screen seemed to me to have a newly-noticed, slight gradient.
I did a second erase/install and everything was fine, with all software installed too. A glutton for punishment, I tried one more erase/install and, once again, some software had not installed and I detected the gradient. It seems that every second install (selecting erase/install) using the discs is not working properly. Again, another install was perfect.
Before posting this, I did another erase install to ensure this observation wasn't pure chance. Sure enough, it did not install Garageband and a couple of other programs, and the screen was definitely slightly lighter on the left. A repeat install again worked fine (all software fully loaded), and the gradient was minimal (if it all), as at the very outset.
Make of this what you will. I guarantee it's as I've reported. With the discs provided with my iMac, it undoubtedly takes TWO installs before everything is done correctly.
Software update confirms this too. With a correct (every other) install, software update will currently present 12 updates. But after each intermediate install, software update will only present 9 updates because three programs don't install.
Click to expand...

Surely, you can find something better to do with all that free time then troll in here, can't you? :rolleyes:

The faux tech-jargon soliloquy was mildly amusing but now you're just becoming annoying.
 
Sir Cecil said:
I'll mention this... I was happy with my new iMac screen, but the need arose to erase/install using the provided discs. However, I noticed two things afterwards – certain software hadn't been installed (Garageband for example), and the screen seemed to me to have a newly-noticed, slight gradient.
I did a second erase/install and everything was fine, with all software installed too. A glutton for punishment, I tried one more erase/install and, once again, some software had not installed and I detected the gradient. It seems that every second install (selecting erase/install) using the discs is not working properly. Again, another install was perfect.
Before posting this, I did another erase install to ensure this observation wasn't pure chance. Sure enough, it did not install Garageband and a couple of other programs, and the screen was definitely slightly lighter on the left. A repeat install again worked fine (all software fully loaded), and the gradient was minimal (if it all), as at the very outset.
Make of this what you will. I guarantee it's as I've reported. With the discs provided with my iMac, it undoubtedly takes TWO installs before everything is done correctly.
Software update confirms this too. With a correct (every other) install, software update will currently present 12 updates. But after each intermediate install, software update will only present 9 updates because three programs don't install.
Click to expand...


You are not the only one with this issue dude. I was relatively free last week and was doing some expiramentations as well and has the same outcome as you (with incomplete ilife software installation that is). If you happen to reinstall OS X again later on, instead of doing erase and install twice, i suggest going to disk utility during the OS x installation and erase your HDD. Once completed, go with the default option of installing osx on your HDD. That should install all the ilife applications. i did that twice and had a complete installation every time.

As for the gradient issue, well what im seeing here is that on a fresh installation it seems quite obvious but seem to go away with more usage that now some how i barely notice it on a white background. (still more visible on grey though but much better than b4)
 
SaSaSushi said:
Surely, you can find something better to do with all that free time then troll in here, can't you? :rolleyes:
Click to expand...

You should check your facts first. As you can see from at least one reply above, what I mentioned has been experienced by others.
 
Sir Cecil said:
You should check your facts first. As you can see from at least one reply above, what I mentioned has been experienced by others.
Click to expand...

Well, you've already established your veracity level with the aforementioned tech-jargon comedy routine.

If you were genuinely relating your honest experiences this time you have my apologies. It was the

I did a second erase/install and everything was fine, with all software installed too. A glutton for punishment, I tried one more erase/install

that primarily caused me to believe otherwise. Why would any rational individual do such a thing?

Aside from calibrating your screen no software (or OS install) has anything to do whatsoever with uneven backlight-related gradient issues.
 
Sir Cecil said:
You should check your facts first. As you can see from at least one reply above, what I mentioned has been experienced by others.
Click to expand...

actually, i too have experienced better screen color and even backlighting thru trial and error investigation. i took a large hammer and bashed the yellow color cast in the center of my screen... subsequently i was electrocuted and knocked unconscious, but when i woke up there was no more gradient!!!

---

Sir Cecil, in all seriousness now, this is a somewhat-common issue with "large" LCD panels... thought to be caused by:

-Impurities or foreign particles in the crystal matrix
-Uneven distribution of LCD matrix during manufacturing
-Backlight variance
-Thermal induced stress
-Panel assembly induced stress

large Sony LCD high def displays have these issues as well... it's not just Apple (eventhough Apple is totally lame for pushing ANY of these out for sale)... the 24" iMacs that have these ghetto screens are because the iMac is too thin and too hot... well, it's what i believe anyway... and it certainly makes more sense than your "evidence" that some magical reinstall of the mac os fixes the screen problems.
 
After reading this thread for a while I went to to my local Apple Store. Every 24'' iMac was perfect. I changed the Desktop to solid colors and it was all even. I was surprised after seeing some pics of screens really screwed up. I don't know if fixed the problem or what but these screens where flawless. I would recommend that people go check it out.
 
K3mp said:
After reading this thread for a while I went to to my local Apple Store. Every 24'' iMac was perfect. I changed the Desktop to solid colors and it was all even. I was surprised after seeing some pics of screens really screwed up. I don't know if fixed the problem or what but these screens where flawless. I would recommend that people go check it out.
Click to expand...

i agree... when i was exchanging my first iMac, the 24" iMacs in the stores were perfect, which was a relief assuming that my replacement would be just as good...

it wasn't...
 
I have decided not to exchange my iMac due to the fact the gradient seems to come and go. It does not really affect my day to day work and I can't be bothered with all the hassle of wiping my machine and then reinstalling everything once I get a new one.

That said, if the gradient appears permanently then I think I will exchange it.

Overall being a switcher who has watched Apple grow and produce interesting stuff and the dismal attempt at Vista from Microsoft I started to believe Apple were somehow different that other global companies. However they are not, I paid £1500 for a machine with a slight defect which seems to be apparent in hundreds of machines and does not seem to be a very visible issue in the press or Apple's PR in terms of recalling machines. The OS is fine and there are oddities I am not used to but I have had no crashes etc however the hype and fanboy-ism really is a hindrance to Apple rather than a help as I believe it creates a halo effect around Apple's head in which it cannot live up to and they come to a crashing fall when things like defects in their products appear.

Anyway that is my rant over and I will see how my screen develops over the next few months. Fingers crossed I can live with it.
 
Gradient iMac 3Ghz

I received my iMac a couple weeks back, I saw what I thought was a gradient right out of the box, and checked it with a meter -- there was an f-stop difference brighter in the left side mostly at the lower corner. [I noted that my attached Samsung portrait display had no gradient at all.] Having two monitors made the gradient more noticeable, despite my best attempts to say "it's not that bad." I also detached and moved the 2nd monitor to make sure that the Samsung was not causing this.

I called Apple who did suggest omitting some preference files that had migrated, etc. and also creating a new test account -- again I really tried to talk myself into thinking it was OK, but really there was no real improvement on the meter. I lived with it for a few days.

I then did have one odd quirk for several reboots 2 nights before the return: a stall at the initial white screen (before the blue) -- it stoped with all items removed except keyboard and mouse, then recurred with powered hub, firewire 800 drive, and 2nd monitor attached. I unplugged all items overnight, then that problem ceased -- but that additional glitch made the return a done deal.

I took it to the Apple Store at the 14 day return point. I showed them the computer with a medium gray screen, as well as with the imac gradient test posted online here:
http://downloads.zac.ch/imac/imac_gradient_test_24.html
The gradient was even more pronounced than before (from the glare of the store's lights?) and they were happy to take it back.

Post-exchange: my new iMac has no gradient, and no bleeds -- A-OK...
...Happy camper.
 
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