Video ram failure?

My 6 year old iMac/PPC running 10.5 may have died. Without warning the screen went blue, and nothing would change that. I did the Apple Hardware Test from DVD and everything passed, inc. video ram. I zapped the PRAM. I went to restart, the Apple logo and spinning wheel appeared, but then the screen went to a mottled white, and after a while black.
Any idea what the problem/solution may be?
Thanks,
JC

The tech seemed convinced it was a failed graphics processor, and not worth repairing. Does this seem likely/reasonable?
A failed iMac graphics chipset (processor and VRAM together) requires a total logic board replacement as the video hardware is integral with and soldered to the logic board. Therein lies the high cost of repair to which the tech alluded.
Is this a G4 or a G5 iMac? That might make a difference in the "fix or toss" decision process. The G5 is more capable that the G4 and would be worth having a little more money thrown at it.
If there is a compelling reason to keep this iMac (like mission-critical software or hardware that won't run on a newer Mac, then you have to give weight to the "fix" scenario. However, the G-sereis Macs are becoming more handicapped every day as web sites and developers focus on the Intel processor that Apple adopted nearly six years ago. You cannot upgrade the OS past 10.5.8 on a G-series, and new software seldom supports the PPC processor. Neither can you run the latest versions of Flash that is powering so many web sites.
So it comes to "what tasks do I do with this computer?" I used a nice old G4 PowerMac tower (circa 2004) well past its useful stage and just recently picked up a 27-inch iMac i7 Quad core as a refurb directly from Apple. I'm sometimes asking myself why I waited! I feel like I've stepped from a pushcart to a Ferrari.

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