White screen with confetti on start-up and intermittent black screen . Video card failing?

Is the video card starting to go ? It is an early 2008 Imac . Keeps powering up but white screen with confetti for a few seconds on start-up . Display did also go black for about 5 minutes last week but also came back . I'm thinking video card degradation?

The most common cause is the MLB or GPU.
You can run the AHT (Apple Hardware Test) (http://support.apple.com/kb/ht1509 OR http://support.apple.com/kb/PH11342) and see if that pulls up any results, otherwise, book an appointment online at your local Apple Retail Store free of charge, for a free assessment and diagnosis. (http://www.apple.com/retail/)
Regards,
MiiCK

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