I updated my iMac to 10.7.3 and about an hour later the screen began to flicker with a gray line on the upper side, and it also flicker green and red small pixel lines all over the screen, mainly green.

I updated my iMac to 10.7.3 and about an hour later the screen began to flicker with a gray line on the upper side, and it also flicker green and red small pixel lines all over the screen, mainly green. The computer froze with these pixels, so I shut it off and restarted it, and there were this green lines everywere. So I turned it off, and the next day I turned it on and it began to work just fine, but suddenly the same thing happened again, and when I restart the computer again there are these green and some red pixels everywere.
I've read 10.7.3 is giving people many problems, but I never saw that it gave one like this. How can I fix this, or what will Apple do to fix this problem they caused me with their update.
Thanks

Contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

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