iMac screen stuck while watching youtube.
After restart system stuck on grey screen :(
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.