|You're going to have to reset the BIOS. Unplug the power cord, open the case & look for the motherboard battery. It's round & flat, about the size of a nickel. Remove the battery, wait a few seconds, pop it back in place. Close the case back up, boot the system, then immediately enter the BIOS & correct the settings.|
BTW, while you have the case open, blow out any dust...do NOT use a vaccuum.