How do you rest CMOS?

how do you reset CMOS?

 

Take out the CMOS battery for 30 seconds.

 

If that does not work out then try this.

The following debug routine will clear CMOS, BIOS, Passwords, Settings, Viruses, and other items residing in the CMOS. During this process you may get returned characters which are an indication that the string has gone in, if you by chance get ERROR ensure that you have typed the line in correctly, if not retype. Ensure that you do not skip any lines, that it is ALL typed in correctly to help prevent problems. Before running this Debug routine also ensure that you have read the above disclaimer.

You need to boot through a bootable CD start the comp in DOS Mode. then at the prompt type " Debug ", After Typing Debug you will get "-" which is were you can begin by typing A and pressing enter.

A <ENTER>
MOV AX,0 <ENTER>
MOV AX,CX <ENTER>
OUT 70,AL <ENTER>
MOV AX,0 <ENTER>
OUT 71,AL <ENTER>
INC CX <ENTER>
CMP CX,100 <ENTER>
JB 103 <ENTER>
INT 20 <ENTER>
<ENTER> Note: Nothing is typed on this line
G <ENTER> By pressing G this will execute the above script, ensure you have read and agree to the above disclaimer.
Q <ENTER>

Then reboot and you will get a Setup Checksum Error. Go into setup, correct all the incorrect values, time, date...

PS : Debuging the CMOS Battery might lead to hardware failures if not executed correctly

 

You can either use a software like killcmos or whatever its called, they are quiet a few out there, or if you have your motherboard book you can check how to move the jumpers to reset it.
Removing the battery isnt recommended, but if you have no other resource than you can reset it that way too.

 

Removing the battery is fine, it doesn't hurt anything and isn't hard.

The only thing it doesn't work for are laptops.