Monitor freaks out with colorful blotches/lines; often precedes crash

I have a first gen iMac g5 20 in. The mother board was replaced as was the power supply under Apple's replacement program. I have subsequently replaced the power supply again. I also wiped the HD and reinstalled 10.5.
Basically, shortly after booting up, the graphics freak out. A strange colorful shift will happen, or window elements will ghost with vertical lines. Often it will crash after doing this. Sometimes if I stop immediately and let it fall to sleep, I can wake it back up and use it again, but eventually (minutes, not hours) this will happen again and crash.
I took it to the apple store. My only recourse was to replace the moboard. I reminded them they'd done that once. That's my only choice. I've had fizzled graphics cards in the past and that's exactly what this feels like. Apparently it's part of the board.
Here's the deal. Is it reasonable in anybody's mind to have to replace your motherboard twice in the life of your machine? I had an powermac g3 that lasted for 10 years, until I retired it to my wife's classroom, where it still works.
Has anyone else had this ongoing issue with this model? It seems absurd to buy a machine for $1500 that in order to keep functioning after 5 years is to pay another 900 to replace the mother board.
Are there any other solutions?
Thanks,
Matt

Toot,
I bought Apple for the product quality.....so what gives?
These logic boards and power supplies were all victims of the "capacitor plague".
http://en.wikipedia.org/wiki/Capacitor_plague
"Circa 2005 Dell will spend some US $150 million replacing the motherboards entirely and another $150 million on the logistics of determining whether a system is in need of replacement. HP reportedly purged its product line in 2004. The motherboards and power supplies in Apple iMac G5s[3] and some eMacs[4] were also affected."
So we've got 18 Dell boards at school that failed after Dell stopped their recall. They have twice as many caps as a G5 logic board.
It's so common it's the first thing I look for if something fails and it has 'lytics in it.
Richard

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Monitor freaks out with colorful blotches/lines; often precedes crash

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