You could try a new MB battery then clear CMOS and reflash BIOS.
I had a X850 with a power connector so I just assumed the 800 had one too.Sounds like a bad card and slot.Any warranty left?
Also check the power connector for the card and make sure it has juice.
Sounds like either your X800 died and damaged the slot or the slot died and damaged the card.Does the 7600 work ok back in its original...
You can buy a tester for around $20 US (better ones with LCD display are around $30)or take the PSU into your local computer shop,most small shops...
If your PSU died it can sometimes damage part or all of your system.
You could try re-seating your 1950 pro and test your PSU.
Let me see if I got this right.The onboard graphics work but the X800 won't work in either system.Did you try a different card in the system with...
This one has some strange and funny stuff. http://revision3.com/webdrifter
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