G5 going funny

I have a G5 dual 2.0 and the last 3 weeks it has been crashing and the dancing blue pixels problem. I have reinstalled the operating system and after 2 whole days of no problems, it has all started again.
The dancing blue pixel problem is back on random restarts, and the G5 wont boot up from any disc other than the original System install cd. I tried booting from a Tiger install cd and it went into a kernal panic mode on startup and the fans started going at full speed.
Should I just take it straight back to apple (its only 2 months old) or has anyone got any ideas or solutions?

the artifacts would denote a failing GPU right?
back to apple i say

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