Originally Posted by r2d2d3d4d5
I've just ordered an Antec 480W TrueBlue.
If that does not work then I'll know I that I probably have a duff card.
I'm sorry to tell you this, but my guess is you indeed have a faulty card. Especially the 'artifacts at boot' makes me think this is the case. Why? Because I have a X800PRO with the exact same problem and had to send it in for RMA (still waiting...)
Good luck getting a new one though!