It will boot up fine on onboard VGA and run fine. Reinstalling old ATI card and the system works fine after it reinstalls driver automatically. I have uninstalled all associated drivers, disabled VGA and then shut down system and installed new card. The drivers/software will not install prior to card installation "hardware not found, installation cannot continue". The whole system works great on the new PSU, but the 6 pin adapter was never used prior and is a new variable. It is plugged in. The card is getting some power because the fan is on.. With the new card installed it boots up (600 x 800) and I install drivers on CD. After drivers install, computer only will boot into safe mode after cycling on and off for several cycles. Explanations in instruction manual indicate 1) Improperly seated card (not likely since seated multiple times) 2) Problem with graphics card slot (not likely since old card still works fine 3) PCI E not connected (I have power cable connected at both ends) 4) Problem with graphics card 5) Onboard VGA adapter not been disabled (problem still occurs even after disabling).