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not sure if this is a SuperUser question or AskDifferent question

When I start up my iMac 21.5" (Mid 2011 model) this morning, my screen looks like this:

enter image description here

Then the computer is completely frozen. Is the display card going to die?

using Mac OS X 10.10.3, Graphics: AMD Radeon HD 6770M 512 MB

  • Do you still have hardware-warranty? – Gabkano Jun 3 '15 at 2:14
  • I'm afraid the warranty expired 3 years ago ( I have 1 year warranty only ) – Raptor Jun 3 '15 at 2:49
  • haven't tried yet. will try if I have time later. (p.s. is there any software that I can test the display card status?) – Raptor Jun 3 '15 at 3:31
  • why downvote ? please provide reasons, thanks – Raptor Jun 3 '15 at 7:52
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If you were looking to test the video card status I believe you could restart your iMac, hold the Option key right before the chime, and choose the Recovery disk. From there you can run system diagnostics.

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    As my Mac is mid-2011, I should use Apple Hardware Test (AHT) instead. Will try tonight – Raptor Jun 3 '15 at 7:52
  • Could you tell me what ended up happening? Same 2011 iMac problem here. – MicroMachine Apr 28 '16 at 22:34

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