Once you are sure that the positive pole of the battery is visible, gently remove the battery, taking care not to touch any other part of the motherboard. Go to your local tech parts retailer, and buy ...

The coin-shaped part on your motherboard is the CMOS battery, a Lithium coin cell. This battery provides the small amount of power the CMOS chip needs to keep its settings when your PC is turned off.

Reseating The CMOS Battery Alternatively, another way you can reset the CMOS — and one that's more or less standard across all motherboards — is to physically remove and re-seat the CMOS ...

Locate the CMOS battery on your motherboard. Gently pull it out of the socket. Wait for a few minutes and reinsert the battery with the correct polarity.

How to Clear CMOS on an ASUS Motherboard. The complementary metal-oxide semiconductor (CMOS) holds the data your ASUS business computer uses to configure the hardware.

This is all strong evidence that the CMOS battery needs to be replaced. But the motherboard is only 2 years old. I have a 386 that still has a good CMOS battery. How can the battery die so quickly?

Look for a jumper labeled "CLR_CMOS," "CCMOS" or something similar, often located near the round silver battery on the motherboard. Jump the pins according to the instructions in the documentation.

Sometimes, the battery will be on a daughterboard, other times, especially with new boards, there will be no CR2032 in sight and the board will rely on the main battery to provide CMOS settings ...

In most modern PCs, the CMOS battery looks like an oversized watch battery. In some, it may be soldered to the motherboard, making replacement a task for experts.

Just removing the CMOS battery and letting it sit for about five minutes should do the same thing, minus button wear. Or, if you have a motherboard with a CMOS reset button, you can just press that.