Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

iMac random restarts but no problems

H

Hippocrates1985

macrumors member
Original poster
Oct 13, 2008
43
2
hi guys,

I really need your help. I do not know what info do u want to know about my iMac. It's Mid 2011, 2.7 GHz intel Core i5 Processor, 32 GB Memory, and running Sierra.

Lately I have random restarts and I have done the Apple Diagnostic test and it has given me no hardware errors. I also used TechTool Pro 9 and the same thing with the results saying no errors at all.

I really need your help solving this puzzle.

Thank you
 
Have you added RAM?
Do you have the original RAM?
Have you tried reverting back to the factory RAM?
Have you tried re-seating the RAM in the slots?
 
Fishrrman said:
Have you added RAM?
Do you have the original RAM?
Have you tried reverting back to the factory RAM?
Have you tried re-seating the RAM in the slots?
Click to expand...

Thanks for the reply. I have taken all the RAMs out and put the original RAMs and nothing change. I still get the random restart. One thing weird thing that you might help me with is that I have moved all the files from this iMac to and external hard drive and now the iMac stays on longer than before. I thought that I have a problem with the hard drive but I have tested the hard drive with many applications and all of them says no error or problems with the hard drive. The fans are working good and no high temperature. Also I did format the hard drive and reinstall Sierra and the problem is still there :-(

I hope that you could help me in this puzzle and narrow down the problem because all the applications that I used saying that I do not have any hardware problems
 
your graphics card is failing. 2011's are know to have this issue. If its not ram, its the GC. There is no 100% way to test the card as the issue is 'random'. Replacing the card will fix the issue
 
Weaselboy said:
https://support.apple.com/en-us/TS3742

Are you getting the kernel panic screen like in the screenshots at this page?
Click to expand...

yes I get that and to exact it's this pic

https://support.apple.com/library/c...es/en_US/osx/kernel_panic_symptoms_mtlion.png
[doublepost=1493118333][/doublepost]
ryguy92000 said:
your graphics card is failing. 2011's are know to have this issue. If its not ram, its the GC. There is no 100% way to test the card as the issue is 'random'. Replacing the card will fix the issue
Click to expand...

Should be a way to test it ? I do not see any problems with the screen at all :-(

I mean you r not going to buy GC if you r not sure the the problem is really from GC
 
Its actually quite unbelievable that nobody has brought out a software-based GPU tester / stress tester for OS X?
 
Hippocrates1985 said:
yes I get that and to exact it's this pic

https://support.apple.com/library/c...es/en_US/osx/kernel_panic_symptoms_mtlion.png
[doublepost=1493118333][/doublepost]

Should be a way to test it ? I do not see any problems with the screen at all :-(

I mean you r not going to buy GC if you r not sure the the problem is really from GC
Click to expand...
after working on these machines for 15 years its an either/or scenario. What is happening is the machine is expecting a certain data stream to move back and forth from the GC, when it doesn't get that information it will kernel and shut down. You can try stressing with an external OS, changing the ram, and replacing the HDD. These are all causes of this particular failure. However, your 2011 iMac is a known flaw with this GC. If you want to attempt to narrow it down, try accessing the kernel log for that time frame and dumping the kernel panics here. That may give us a better idea as to what is going on.
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back