Need a new PSU? Or something worse?

I tried upgrading my video card from an evga 260 to a 465 from the same manufacturer because the 260 would display weird distortions and crap out when gaming in full screen, but I had a problem with one of the ports on the 465(one going to my monitor, the other going to a tv), otherwise, it seemed to work fine. I RMA'd the card for a new one, but when I tried to boot with the new card, the machine seemed to power on but nothing appeared on my monitor. It didn't seem like windows was booting, but then I'm not sure since there was no activity on the monitor. When I reinstalled the old card, it took several attempts for the bios to post and windows to load but when it finally did, I didn't have any problems. I RMA'd the new card and tried installing the replacement, and had the same problem. I was advised to try the card with a new power supply, but wanted to know if anyone had another opinion? My motherboard is an Asus P5QPro; power supply is an Antec 850w (can't remember the model); and windows xp 32 bit. Thanks for the help.

Each coefficient of the PID control could be self-tuned by using the principle of the immune control and adaptive PSD control law.