Need help to diagnose Video issue (G5)


trouble shooting dual 1.8 g5, no known history - received w/out hard drive or ram. installed known ram , ati video card. video tests typically fail (1 out of 8 tests pass) in apple hardware , apple service discs. fail means machine locks , needs powered off. replaced video card w/known nvidia card, system boots displays no video. other tests in apple hardware , apple service pass. i'm not go next . . .
 

so aht boots video?
 


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