Display flickers lines and then dies black until device has hot temperature

Hi Discussion,
I have a very strange problem since approx 2 weeks. My PBG4 is working fine and it is a very nice device, but until it reaches it's working temperature it is playing around with the display. There are lines (horizorental) flickering around the screen and then it is getting black and normal again. This process repeats every time the device is startet oder woken up from standby. If I try to adjust the brightness of the display with the buttons, this is working, so the lamp seems to be ok. I think the graphics board has some kind of damage. Did anyone else experience such problems? Is there a solution? I do not want to loose my device...
Thanks Nico
PowerBook G4   Mac OS X (10.4.7)  

Brought a new one.

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