12-29-2015 05:56 PM - last edited on 12-30-2015 06:46 AM by Majestic
I just purchased a used c460 and discovered it has an administration passowrd in the bios. How do I go about restoring the bios so I can restore the computer to be able to use it. As of now, all I cand dobos boot from the hd into a windows she'll program.
Mod's Edit: System model added to front of Subject line to improve visibility / clarity.
12-30-2015 06:52 AM
Welcome to the Lenovo Community !
The simplest solution would be to contact the previous owner, if known, and ask them.
Otherwise you could try removing the motherboard battery to clear the CMOS, but that will require a little disassembly. With the battery removed from the motherboard, press the Power On button for 15 seconds to discharge any residual electrical charge on the motherboard to clear the CMOS which in turn should remove any BIOS passwords.. The link below is for your model's Hardware Maintenance Manual for your reference.....
02-25-2017 10:44 PM
I have a C460 that has the same issues. The Bios have a Admin password and i cant remember what it is.
There doesnt seem to be a jumper w 3 posts on my board.
I can't seem to find the instructions for the board either. It has a few numbers on it.
Can anyone tell me how to reset the bios and clear the password? I have tired the above listed and its not working.
02-26-2017 06:43 AM
Welcome to the Lenovo Community goldenwelp !
If removing the CMOS battery and pressing the power button didn't work and you do not have any CMOS jumpers on the motherboard, the next thing I would look for is two contacts on the motherboard labeled CMOS. There was a posting a while back from another member who was able to clear the BIOS passwords using those contacts with a different Lenovo model. Please review this thread for additional information.....
Please be advised that the shorting out of the contacts is done so at your own risk. I don't own any of the discussed models nor have I had personal experience using the CMOS contacts on those motherboards.
02-26-2017 09:55 AM
There is a 6 pin jumper on my board with the same numbers as the one you referred me to.
The pin isnt in the same spots as that post.
1 - 2
? - ?
? - ?
Thank you for your assistance!
02-27-2017 07:59 AM
Since the jumper block isn't clearly marked as being the "CMOS" jumper, I would be concerned as to what actually the jumper controls. Jumping different pins may have an unknown effect if it is not the CMOS jumper block.
If it follows the standard pin assignments, the pins would be numbered like this.....
1 * 2
3 * 4
With the computer unplugged, you could try removing the jumper from pins 1 & 3, then press and hold the power button for 15 seconds. Then re-install the jumper, plug in the machine and try powering it up to see if the issue is resolved.