My Imac desktop screen suddenly started to change colors and pattern appeared

My Imac desktop screen started to "flip out", things were moving around and strange patterns filled everything on the screen. After a minute it stopped. Is this a warning sign of a hard drive meltdown?

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.
BTW, 10.6.1?

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