Cmos chechsum error

MKBL

Splendid
Nov 17, 2011
429
3
24,565
My friend's computer showed cmos checksum error, and when I went to cmos setup, date and time were wrong, even kept changing the value while I tried to correct it. Now I replaced the cmos battery, the display doesn't come up. It came up once, but cmos setup showed the same symptom- date/time value kept changing. Should I just throw it away? It is old sff pentium machine, but had been serving well for kids' playing and education.
 
Disconnect the power cord from the wall. Find the

clr_cmos

jumper on the board, it's a 3-pin connection with a jumper connecting 2 of the 3 pins. Pull the jumper off and put it on the middle pin and the pin that was not "jumped." Leave it there about 30 seconds, then replace the jumper to connect the 2 pins it was originally on. Plug the power cord into the wall socket and power-on the system.

That should have corrected the check-sum problem. If you had any custom settings in the BIOS, you will need to reset them.