Can I clear cmos just by removing battery?

mazooni · Jan 12, 2014

I have a really old desktop with a password for bios that I forgot. I read online and it said that clearing the cmos would reset everything. Some motherboards have a jumper but it said that removing the battery for about 5 mins and putting it back in should work. While the battery is out do I turn on the pc or do I keep it turned off for 5 mins then turn it back on?

zink1701 · Jan 12, 2014

No leave the PC off and wait, also turn off the PSU with the switch or unplug it from the mains, wait then reinstall batter and power up. That will clear it.

mazooni · Jan 12, 2014

zink1701 :

Is waiting 5 minutes enough?

zink1701 · Jan 12, 2014

It should be, it just gives it time for any residual voltage to be discharged from the system.

esco_sid · Jan 12, 2014

Another way to clear the CMOS is to short the "CLEAR CMOS" jumper on your motherboard, assuming you have one (most motherboards do).

Open your computer and look around your motherboard for a jumper labeled like this. These jumpers are usually located near the BIOS chip itself or near the CMOS battery.

You can watch this video too https://www.youtube.com/watch?v=-9RnIj-EcdQ

mazooni · Jan 12, 2014

Awsome. Thanks everyone for answers and suggestions.

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