Old IMac 17'' video sync problem at boot

Hi,
A friend has brought his IMac 17'', which has a video sync problem. At boot, all screen lines are out of sync, but I can more or less recognize the apple logo, which disappears later. Something happens at least, there is a boot processing going on I think.
I tried to reset the parameter ram, it does not help.
I have heard of a power supply problem that can cause that problem. Is that right? The computer serial is: W8446APAPP7.
Can anyone help?
Thanks!
Philippe

Here's a simple test case I've made, it's just a bunch of lines drawn in an orthographic OpenGL view. When you scroll horizontially with scrollbars or by space+dragging, the effect is very noticeble.
The .app and source are available here:
http://www.johnpsimons.com/mac/TestApp.tgz
http://www.johnpsimons.com/mac/TestSource.tgz
I believe this is the same problem as with the Apple homepage Flash thing. It's not just a problem with Flash.

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