power off the pc and pull the plug from the wall and let the mb drain of power and then use the clear the cmos. jumper. then take the card out and reseat it. if the card not see on the bios boot screen or windows. try it in the other video slot if your mb has one. if it does not..try the card in another computer or try an older card in the video slot if you have one. you want to rule out if it the card or the mb or the ps. (cold have lost power on the pci connector.
Going to try that ..