Quad Core G5 Won't Boot

When starting up the screen has all sorts of strange dancing pixel things and when it gets past the grey Apple start up screen it just goes to a grey screen with the dancing pixels.
I've tried booting in safe mode and nothing happens.
I've tried booting to the install disc and nothing happens.
I've tried booting in verbose mode and it doesn't look like anything is wrong and nothing happens.
I've done the hardware test and it says everything is fine and it finds what is there and does all this with the crazy dancing pixels on the screen, it even shows all bootable drives.
Any ideas?
Oh it does boot in Target Disk mode though.
Message was edited by: Ratz1

Hello, Ratz1
I would try using a really cheap graphics card. Do you still have the stock card, or is THAT the stock card? Also you may be able to use graphics cards from other Power Macs (Power Mac G4 and G3 B&W towers respectively) and install one of their cards granted it wont be high performance, however this should narrow it down to one component. If the problems go away, then its the graphics card. If the problems persist...well then I would start checkin other things...this is a G5 Quad, so with that being said I would check the liquid cooler for leaks and such. But as mentioned earlier by japamac, I highly doubt its a bad logic board. Its more than likely a bad GPU as these go bad fairly often. =/ Unfortunately. Hope this helps. =) Also, if you dont have any older Power Macs, see if anyone you know does, or you should be able to find the old technology on eBay or craigslist for even cheaper. But I would recommend performing these tasks prior to buyin a new GPU.
Regards. =)

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