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Also irritating is the fact it's a 6-bit LCD, so it can only produce a few million colours and makes up the rest with eye trickery of dithering and frame rate control. This isn't as noticeable under OS X (though if you have keen eyesight and move your eye quickly to another area of the screen you can sometimes catch the slightest "shimmering") but under Windows and Linux the ATI drivers don't dither properly, resulting in ghastly moving interference-like patterns and stripe effects especially on mid-dark greys and blues.

To be fair these are both characteristics of cheap TN panels (in the 20") rather than actual faults, but it does annoy me that Apple have stooped to putting horrible cheap crap in their systems when I always thought they could be trusted for quality. You get what you pay for I guess.

Just to clarify your point, it is only the 20" iMac that uses the 6-bit TN panel with color dithering. The 24" does not.

When I first saw the $300 price drop on the 20" iMac when the Alums were released, I thought it was a good move by Apple to lower the price, since the 17" disappeared. But knowing that they achieved it with using a low-grade LCD panel is a bit concerning.
 
Whats the best way to tell if I have a gradient issue? I just bought and setup my new 20" iMac Wednesday. Is gradient problem usually side to side or up and down?

Matt

Do not go looking for trouble or you will find it...

I can find issues with every display that I use/see from LCDs to CRTs

I do not use my Mac with a flat grey background at any time, nor do I have my head tilted at some degrees of centre when using my Mac.

In normal everyday usage you will not see nor even notice the issues with the panels that Apple have decided to use.

The 20inch Alu iMac uses a TN type panel the cheapest money can buy, and gradients are a known issue with this type of panel.

People come into my house use my iMac and do not notice the TN panel issues, and nor do I unless I go looking for it.

Enjoy your mac
 
Perfect

My iMac came perfect. I ordered it immediately following the release in August and I haven't noticed any problem. I've done photo and video editing and I haven't noticed any screen issues...or hardware issues.

There is one tiny little nick in the body though.. and unfortunately I noticed it and it drives me NUTS!


But other then that it's an amazing machine and I LOVE IT!!!
 
We just got a new iMac for our library software at school, as in TODAY(long story - basically, we had a G3 B&W running 9.2 that we haven't been able to get the last two upgrades for our library software and the last upgrade for Accelerated Reader, so we're getting a new server, iMac for checking out books, and by the end of this school year a new iMac lab!), and its utterly flawless. And after all of us being used to the 15" G3 iMac screens which by now are all dim and dark, the screen on this baby is freaking HUGE and BRIGHT!

But there is one minor problem...we got it with Leopard on it and it was supposed to come with Tiger installed and Leopard discs included so we could upgrade it when we got the server, and because Leopard doesn't work with Classic applications, it also doesn't work with Classic servers such as ours...so its currently not able to be used for anything other than a beautiful computer not available to students. We can't even print off of it because that's all connected to the server. :( It is teh sadd. But that's more so of a problem outside of anyone's control than a problem on Apple's/manufacturers part.
 
by dud, i mean something wrong with it (ie, gradient screen, condensation, loud humming, etc).

it seems that a bunch of users are reporting issues with their imacs. i'm sure its just a case of a loud minority. im waiting on my first imac's arrival. until then, who HASN'T had to return/exchange their first aluminum imac?

Mine is perfect, sorry to disappoint you.
 
I checked the screens on every 24" iMac on display at the Apple Stores at the Grove in Los Angeles as well as the Westfield Mall on Santa Monica Blvd. and not one of them have the gradiant issue, or any other issue as far as I can tell.
 
My 20 inch alu iMac has a gradient issue, but still I don't think it's a dud.
First this gradient you will find on most TN panels.
Second, with the calibration I made and using DarkAdapted the screen looks awesome, better than many other TN panels I have seen and/or used, even better than the Eizo Flexscan TN panels at my work (but this may be because they run Windows XP - OSX just looks better)

Actually I am so satisfied with the screen that the complaints I read on forums really start to annoy me.
Stop staring and comparing different parts of the screen for gradients and start working/playing with the damn computer!

(True, if you're a professional graphical designer it must be disappointing)
 
I've had my 24" three months, and thought it was perfect; it looked gorgeous with everything I did. But after reading all the complaints, I went looking. First I had to find a full screen gray image; it's not like I ever spend any time looking at blank gray screen, and I never noticed it during the 30 secs. of blank screen during boot up. Then I stared at it for 10 min. before I decided that it was just a tad darker on the right side than the left. But it's so subtle that I'm still not entirely sure if it's the screen or my eyes; stare at anything long enough and your eyes will play tricks on you. I also never noticed any light bleed until I went looking for it by watching a DVD in a completely darkened room, and saw a bit along the bottom. But then I never use the computer in a dark room. So is it perfect? I guess not. Do I care? No. Where's the problem when the flaw is only visible when I look hard for it under completely artificial circumstances? Survey says... not a dud.
 
Went to the Apple store in SF this weekend. None of the 24" iMacs exhibited the gradient issue and I TRIED to make it happen :). On the other hand, the newish 24" iMac in one of the labs where I work does have this issue. It is not really that noticeable unless you look for it. Everyone who uses the machine loves it and they don't notice the gradient.
 
Went to the Apple store in SF this weekend. None of the 24" iMacs exhibited the gradient issue and I TRIED to make it happen :). On the other hand, the newish 24" iMac in one of the labs where I work does have this issue. It is not really that noticeable unless you look for it. Everyone who uses the machine loves it and they don't notice the gradient.

How do you "try" to make a machine exhibit a technical problem? I mean, it's either got the problem or it doesn't, yes?
 
Just one dead pixel and a bit of dust in the glass. Of course there's nothing I can do about either really.

Other than that, perfect.
 
1st one had a dead pixel after 2 weeks of use!
2nd one i recieved yesterday morning, powered on and condensation :(
3rd one i picked up yesterday afternoon, condensation AGAIN :'(

Quite pissed off about the condensation issues as it shouldnt be a problem!
Im in New Zealand, its the middle of SUMMER here.
Picked up my 3rd iMac from Apple, popped it in the backseat and drove 30mins home in the sun thinking the condensation wouldn't be an issue.

I WAS WRONG

Waiting back to hear from Apple now... ugh
 
by dud, i mean something wrong with it (ie, gradient screen, condensation, loud humming, etc).

I have none of the above problems with my iMac. I bought it 3 months ago and couldn't be happier with it. It is an amazing machine and serves me well. It's my first mac and I'm very pleased indeed.
 
First post - hello all!

I picked up a new iMac 24" yesterday as a long overdue replacement for my G4 Cube. Condensation appeared in the bottom right-hand corner 5 minutes after booting, but disappeared 20 minutes later. I called Apple and they said I should take it back rather than wait to see if it reappeared.

I was relieved when I turned it on that there were no dead/stuck pixels. However, it wasn't long before I noticed the gradient issue. It's quite subtle but now that I've spotted it I'm always going to be aware of it.

It was the last in stock where I bought it, so I'll be waiting a while for a replacement. Just hope that newer stock might decrease the chance of any problems, but I don't know if it works like that.
 
Hi there!

I have my iMac 24" with 2,8 GhZ since 1 month and after installing Leopard (because Tiger was pre-installed), I discovered no problems. Everything worked just great!

When I installed Windows XP (Yeah, I know, Windows...but I need it for Phase2 and Auto CAD) I was amazed about the fastness, this odd OS had on my iMac.

After using WIndows XP for about 1 week, big troubles appeared:
My iMac would start up normally in OS X with it's white "Boot Screen" and it's turning wheel, than switching into the blue screen mode (normally, just before displaying the desktop). But that's all - it WON'T display the desktop, just blue screen! When I boot into Windows XP, some kind of disk checking tool will appear, checks the whole disc, reboots and the whole damn thing goes in the next round... So I can't boot into Windows and OS X.

Well, after new installing Leopard and deleting the Windows partition form my system I thought, it will work again and re-installed Windows again. And here we go - the same problems again.

At my Apple store the "technician" told me that this could be a HDD failure - so I think I have to bring back my iMac and get a new HDD... :(

greetings

Alex
 
I thought my 24" 2.4ghz machine was perfect...that was until a couple days ago when I opened the RAM door...he plastic that holds the screw guide in pretty much fell apart when i unscrewed the screw...see my other post for pics...i'm going to try to take back to apple tomorrow.
 
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