Just a quick question, I have been following this thread and was interested in what the problem may be, but not being able to offer help I just lurked.

Do you need a special version of the graphics card for it to work in the G5? Couldn't you just dump in any old card and see what happens? Shouldn't it work even in a basic mode which would allow testing to happen ???

Just a thought. It seems a shame to give up now

Cheers

Cris.