Why has my iMac screen gone to stripes. I am using Yosomite

why has my iMac screen gone to stripes and nothing else. I am using Yosemite

Could be the card or the screen.
Courtesy BDAqua:
Take a screen shot & view that in Preview, move the Preview window around, if you see double lines it's a Video card/VRAM problem, if the lines do not move moving the pic around then it's the LCD or cable.
If your screenshot isn't showing the stripes here, it will most likely mean the screen, LCD panel, is the problem.

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