Hi,
I fitted plenty of cards into motherboards so I know what to do. My 520W Trust PSU has high-end graphics card PCIE connector able to supply up to 150W in that PCIE branch. My friend`s 500W low-end PSU powers his HD3870 with flying colors, so there is no reason for better PSU at all. My system works fine back with my ATI X1950 PRO 512MB graphics card now, so I deny that card could be damaged by my PC. Also if it was damaged by a static electricity it would not work at all, not only in demanding 3D applications. I don`t want to suspect you of not telling me the truth about the card prior sending it, but I deny your suspicion that my system damaged the card on the other hand. I am going to contact OC UK for a replacement, hopefully they`ll solve the problem. I will keep you informed about the progress and ask you for assistance when needed.
With regards