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iMac screen stuck while watching youtube. enter image description here

After restart system stuck on grey screen :( enter image description here enter image description here

Tried All these given below

  • Did reset PRAM
  • Did Hard Drive Verify
  • Re-install Yosemite
  • Clean install Yosemite
  • Working in safemode
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I had the same Issue on my old iMac - it turned out to be defective Memory of the Graphics Card (due to overheating).

I changed the Graphics Card and fixed the problem. There is a very well written tutorial on how to change the Card on iFixit. The only problem would be to find a replacement Card - i paid about 360$ for mine.

  • Before repairing the mac, bring it to an apple authorised service provider to verify that it is the memory of the graphics card. – Jules Dec 22 '14 at 17:49

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