Need help, iMac screen is pixelated

All of a sudden one day, my iMac screen went black for a second, then when color returned, the screen was all pixels. You can't see a thing or do anything on it anymore. Granted, it is about 8 years old, and I have at least 30 of the vertical lines going down the screen by now, but this is really weird. Is it a virus? I have a picture here, any help is appreciated

http://i671.photobucket.com/albums/vv74/jlohnik/1030111351.jpg

Thanks if you can help

Not a virus...
It's a hardware failure - probably motherboard.