cmos checksum error,press f1-not reading keyboard

Not sure what I did,but I did something wrong.

This morning,I took the cpu fan off of my pc to clean out the dust bunny's and I cleaned off and put on some new artic silver,and when I went to restart my pc,I got an error,CMOS Checksum - defaults loaded,press F-1 to continue.My mobo wont or dont recognize that I have a keyboard.

Well none of the 3 keyboards I tried will work,(I have tested them on other pc's they work) and when I plug the keyboard in,the three lights blink real fast.No caps or numlock lights up.

I know that sometimes that can be caused by the battery,I put another one in,same problem.I also cleared the cmos via the jumper.

The mobo is an older ASUS A8V-XE (socket 939,amd 64 4200+ cpu)

The pc was working,not well,but it was working.

Any thoughts/ideas?

Thanks in advance