Computer screen filled with zzz

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my computer suddenly shut down and my screen is suddenly filled with 'Z', from top to bottom. now when i start up my com, my whole com will hang with my startup programs at desktops only.

I need help!
 
Sounds like a damaging virus, or if not, a video failure. First try starting in safe mode (press F5 during boot). If you see any change, what is it?
 
Not uncommon during a video card failure while in the middle of something that is utilizing it.
 
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