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CMOS

By Maintenance Man ·
I have purchased a used computer from a unkown source. The CMOS is password Protected. How do I get in the CMOS with an unkown password.

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by TimTheToolMan In reply to CMOS

Hi you need to clear the CMOS by either removing the battery on the motherboard...but this *may* take a while. Some documentation states that it may take days to clear others says seconds...

Or... you can locate the jumper that clears the CMOS, move it to the clear position wait 30 seconds and then move it back. This is the best option if you can find that jumper - look on the net for an online manual for your motherboard.

Or... you can try one of the utilities found at this site. There are utilities here that claim to be able to erase the BIOS password by clearing the CMOS settings - but I'm not sure how you make them work if you cant at least boot to DOS!

http://www.amptron.com/

Hope that helps,
Cheers,
Tim.

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CMOS

by Maintenance Man In reply to CMOS

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by dmiles In reply to CMOS

Open the case and look for a jumper that near the battery and switch the jumper pins and reboot the computer,reset the jumper to original
the other will be to remove the nickel looking object which is the CMOS battery and take it out and leave out for a couple of minutes the reinsert and reboot,reset the configurations to default
You may want to look at the startup screen and note the number and check at www.drivershq.com to get a utility to identify the MB,also check the bios version for this also

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by Maintenance Man In reply to CMOS

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by TheChas In reply to CMOS

On some MBs, after you set the clear cmos jumper, you need to power the system on, shut down, reset the jumper to normal, and then you can boot.

If you want to find out specific information on your MB go to www.motherboards.org
They have tools to help you identify who made the board, and links to mfg web sites and manuals.

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by Maintenance Man In reply to CMOS

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by Addam Moody In reply to CMOS

I have seen more than one system where the password is writen into EEPROM.

This means that no matter what you do, you cannot clear the password without an EEPROM programmer, or an alternate BIOS chip. Such machines rarely have a clear CMOS jumper(only there to fix boot problems caused by incorrect memory settings, etc.), and tend to use a seperate RTC chip, with a battery soldered over 2 of the pins, covered with a plastic cap that usually says 'ODIN' on it.
Pentium TX boards also used this kind of RTC, but still had resettable passwords.

This is rare, so unlikely, but definately possible. If the machine can still boot then there are utilities to clear the password from DOS, but if not, and it is one of these machines, then there'sreally not much you can do...

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by Maintenance Man In reply to CMOS

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by modijayesh01 In reply to CMOS

I have CMOS.exe that will break your cmos password.

Send me email address.
I will send it as an attachment. very small file.

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by Maintenance Man In reply to CMOS

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