Is my graphics card screwed?

[-pete-]

Hi all,

So about a month ago I got my 2011 iMac back from repair where they apparently replaced the logic board, graphics card and LCD (which thankfully I didn't have to pay for!) due to it completely locking up and refusing to boot (details here).

Everything has been fine for a month until a couple of days ago. The screen randomly started "glitching" with lines going across it, then it would appear offset (wrapping half way around the screen) or with scan lines going through it then it would go into a "seizure mode" (my friends name for it not mine!) where it would flash brightly between bight white and grey before crashing to a black screen.

The issue originally appeared in windows 7 so I booted into OSX which seemed fine and stable for a couple of days until last night when a similar thing happened.

I left it switched off for the night and returned this morning to find that it won't boot into any OS at all and I have pink lines going vertically down the screen for the start of the boot process until it locks up entirely, see the photos below:





Is my graphics card hosed?

[Pakaku]

Whatever the problem is, whoever 'fixed' it apparently didn't fix it. So I'd go back to them and explain what's happening, since it's obviously not working right.

[-tobias]

Hey -pete- ,
did you manage to find a solution for your problem? This problem occurred for me first about a week and a half ago. At first it looked exactly like yours and it would still boot up. I tried some suggestionsI found in different forums but at this point it doesn't even boot anymore - it just stays on the grey screen.

So, I'd be very thankful for any followup on your issue and to hear if - and if so, how - it was resolved.

Thanks,
Tobias

[Brian Y]

Originally Posted by -tobias

Hey -pete- ,
did you manage to find a solution for your problem? This problem occurred for me first about a week and a half ago. At first it looked exactly like yours and it would still boot up. I tried some suggestionsI found in different forums but at this point it doesn't even boot anymore - it just stays on the grey screen.

So, I'd be very thankful for any followup on your issue and to hear if - and if so, how - it was resolved.

Thanks,
Tobias

If it stays on the grey screen it's likely going to be your graphics card.

The issue above could be any of graphics card, lvds cable or the LCD itself. I would verge on it being the graphics card though. Op: take it back to Apple and have them put a new graphics card in.

[powers74]

I would like to see an update on this as well, as my uncle's iMac (20 is having very similar issues. So just now here I am in safari and it started acting up. Safari window went black, all the tabs looking like a cable TV channel that you didn't pay for, and I could quit photoshop, but not safari. Then I scaled the safari window and now everything is back to normal. for now... On startup, the first time, on which it ultimately did not start up, the display demonstrated the striations like in the OP's post, only not as defined. but it didn't start up, and we had to reboot. Anyway, if you find out anything out I'd love to hear.

[cocky jeremy]

General rule: If something is happening to make you think your graphics card is bad, it usually is.. unless it's a bad logic board.

[SonicYouts]

A friend is having the same problem and is out of warranty. We are afraid how much this is going to cost her...was it the graphics card? That's my guess even though everyone says our hardware code is the HDD or HDD Fan....

anything you found would be a great help. thanks!

[zuri]

Originally Posted by -pete-

Hi all,

So about a month ago I got my 2011 iMac back from repair where they apparently replaced the logic board, graphics card and LCD (which thankfully I didn't have to pay for!) due to it completely locking up and refusing to boot (details here).

Everything has been fine for a month until a couple of days ago. The screen randomly started "glitching" with lines going across it, then it would appear offset (wrapping half way around the screen) or with scan lines going through it then it would go into a "seizure mode" (my friends name for it not mine!) where it would flash brightly between bight white and grey before crashing to a black screen.

The issue originally appeared in windows 7 so I booted into OSX which seemed fine and stable for a couple of days until last night when a similar thing happened.

I left it switched off for the night and returned this morning to find that it won't boot into any OS at all and I have pink lines going vertically down the screen for the start of the boot process until it locks up entirely, see the photos below:

Image

Image

Is my graphics card hosed?

Hello

99% of this symptoms I repaired was caused by graphics card.
Try to run a "valley" test on it, that loads your graphics a lot and if its faulty you will see many image defects on screen.

http://unigine.com/products/valley/download/

Cinebench is quite good to compute image defects too.

http://www.maxon.net/?id=1258