after recently switching out my power supply ive run into some roadblocks. first upon start up with ps/2 keyboard plugged in the lights flash once on the keyboard then go off and i get stuck at a screen that says cmos checksum bad as the keyboard no longer works. upon removal of the keyboard and a restart the computer will load up to windows and im aloud to use the ps/2 mouse however if i plug the keyboard back in then the mouse stops working. i am however aloud to use my usb mouse without this problem. currently am using the osk.
in case it helps:
motherboard: asus p4v800d-x
processor: p4 3.00 ghz
memory: 1 gb
any help is appreciated