Quicksilver G4 + Widescreen LCD DVI problem - VERY VERY WEIRD!

Hi,
I bought a G4/867 Quicksilver off eBay. It came with Panther. I already have a 20.1" BenQ widescreen LCD.
I installed Tiger, then noticed the DVI display would fail (display strange blue/black artefacts or a 'fuzzy screen'. I have screenshots if anybody wants them. It is intermittent, and usually occurs after one of the following events:
* powering on the computer
* waking from sleep
* switching from VGA (my pc) input to DVI (my mac) via the monitor
I tested:
* another video card (with native DVI): same problem
* another computer (Mac mini): no problem
* VGA: no problem
I returned the unit and got another. I ran Panther on it for a week with no problems. I just upgraded to Tiger. All the problems above are now happening again. It happened both on 10.4.0 and 10.4.6 (i.e. pre and post update).
If anyone has any experience at all in this, please post here or let me know if you need more info.
G4 Quicksilver 867 Mac OS X (10.4.6) 20.1" BenQ Widescreen LCD

Sorry, forgot to mention it is independent of screen resolution.
Native screen res is 1680x1050. And it works perfectly sometimes, just not reliably. Have tried at 1024x768, 1280x1024, 640x480 and replicated the fault on all of them.
It also happens at startup, which made me think hardware. But it could be as the OS display drivers are loading. The fact that it worked with Panther makes me think software.
Images available:
http://www.geekhut.com/mac1.jpg
http://www.geekhut.com/mac2.jpg
If it doesn't fail, the screen looks perfect. The same screen also works with a PC and other macs.
To clarify, the G4 is using an ADC-->DVI converter, but fault in this has been eliminated by:
- using the same converter with another dvi monitor (no problem)
- installing a native dvi graphics card in the g4 (same problem)
David.

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{quote:}I am using an iMac - first generation of intel-based iMacs - and I have a very weird powering-on and powering-off problem.{quote}
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