"snowy" screen during startup and then White screen

I have an iMac about 2 years old.  It was working fine yesterday.  Now when I start it up, it has a "snowy" or "fuzzy" screen when it boots up with the Apple logo and spinning icon.  After it does its thing, it goes to a blank white screen.  I did the safe mode, by holding shift during restart.  I couldn't read what it was really doing because of the "snowy" screen but after safe mode was done, it went to the blank white screen.  Any ideas or any help would be greatly appreciated.  thanks.

Welcome to the Apple Support Communities
It looks like the graphic card is damaged. Unfortunately, the only thing you can do is to take the Mac to an Apple Store or reseller to get your graphic card replaced

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