Computer BIOS password and password removal techniques

the BIOS password can be removed using these steps :
* There is battery on your main board or a key named ‘clear-cs’. You can hit this key for cleaning the password or if your main board does not have such a key you can easily ‘put put’ the battry and then (for both ways) turn on your PC.
* If you are comfortable with messing around with the inside of a computer, then you can do it yourself – otherwise get a computer technician or the local computer whiz to do it. Anyways here goes. After you open up the case, look for the battery on the motherboard, and carefuly remove it from its socket. Then locate the CMOS jumper (it looks like a small plastic thingy on 2 pins with 1 pin beside it, within a 1″ of the battery). If you’re having trouble looking for it, look in the motherboard manual. After you have found it, carefuly pull straight up on it, and place it on the 2-3 pins(it was on the 1-2 pins). With the battery removed and the jumper moved, turn the computer on, and check to see if you can get into the bios. If you are able to, turn the computer off, put the jumper back on pins 1-2, and put the battery back in. Lastly put the case together and you are done.
* The other answers listed are correct in that removing the battery you can clear your password, but there are some other things that should be said. When removing this battery not only will it remove the password, but it will also reset all BIOS settings to fail-safe defaults so if you have modified settings in the past you may have to modify them again. Also when removing the battery you may also be required to unplug your computer or at least turn off your power supply.
* There are less intrusive ways: Do a google search for “Default Bios passwords” or “Bios password cracker”. Bios passwords are very insecure, and they put default passwords in at the factory that will work no matter what. It sure beats taking the battery out.
* Simply remove the computer case and locate the battery on the motherboard. With the computer off remove the battery for 5-10 minutes seconds and replace the battery. Fix the cover back on and power on the computer.
* Some of these answers will break your PC for Good and you will definitely have to bring it to someone with knowledge. Have you tried simple passwords like ADMIN, or nothing(blank) or the manufacturer’s name or TECH or something so simple you will cry when you find it! PS most of the time when you reset a BIOS you must manually input all the settings by hand, good luck with that if haven’t written them down.
* These are some of the default Bios passwords used with different Bios’s, give them a try first. AMI, Award, bios, setup, cmos, concat, AMI_SW (case sensitive), AMI!SW/, AMI?SW/, j262
* The second answer which is resetting the jumper is fine, but do it without taking your battery off from the motherboard. Taking the battery off from motherboard not only erases your passoword but also resets bios. So just perform the jumper part.
Power off the computer and make sure that it is unplugged.
Open up your computer case. You need physical access to the motherboard to complete this procedure.
Find a circular, (mostly) silver metallic object on the motherboard. This is the CMOS battery.
CAREFULLY remove the CMOS battery and leave it out for about 120 seconds. This will flush the CMOS memory which stores the BIOS password and all other configuration. (See Warnings)
Set the battery back into place and power on the computer.
The computer should then warn you that the CMOS configuration could not be found. You can either reconfigure it yourself or restore defaults. Restoring the default configuration should be fine.
You will notice that the BIOS password has been cleared and you can boot without it. You may reset the BIOS password to something else by going into the BIOS configuration and setting a new User Password (The Supervisor Password controls access to the BIOS, NOT the computer!)
Remember that laptops can be trickier, especially if it’s a newer model. If it has a security chip on the motherboard forget about it. You either have to physically remove the chip or contact the mfg for the “master” password. If you can boot up off of a cd or floppy try any of these methods:
Create a Win98SE bootable media “or anything that lets you boot into MS-DOS” and boot off of it.
When the A:> prompt appears type debug and press enter.
You will then only see a “-“.
Type o 70 2E “include the spaces” and press Enter.
Type o 71 ff “include the spaces” and press Enter.
Type q and press Enter.
Here are a list of common mfg backdoor passwords:
AWARD SW, AWARD_SW, Award SW, AWARD PW, _award, awkward, J64, j256, j262, j332, j322, 01322222, 589589, 589721, 595595, 598598, HLT, SER, SKY_FOX, aLLy, aLLY, Condo, CONCAT, TTPTHA, aPAf, HLT, KDD, ZBAAACA, ZAAADA, ZJAAADC, djonet.
Other passwords you may try (for AMI/AWARD or other BIOSes) – LKWPETER, lkwpeter, BIOSTAR, biostar, BIOSSTAR, biosstar, ALFAROME, Syxz, Wodj
Depending on the manufacturer of your motherboard, you may be able to use what it is called a “backdoor password” to bypass the password problem. Try looking at the external links for possible passwords.
Remember that passwords are Case Sensitive. The last two passwords in the AWARD BIOS list are in Russian.
Sometimes the bios reset jumper has a “handle” and is colored a bright color to make it easy to locate. Also, look in your case near the bottom. If it is a manufactured computer then it probably came with a little sticker with the jumpers and the location of the reset jumper.
In rare cases, the battery may be soldered into the motherboard and very difficult to remove. If this is true, you may need to find a jumper near the battery that achieves the same result. If you don’t know which jumper it is, you CAN test them all. Unplug (really unplug, not just power off) the computer, and start a methodical change in all the jumpers positions, change one, count to ten, change it back, move on the next. After completing the lot of them (on older motherboards this could take a while) plug the PS back in, and boot up. You may risk damaging your computer with this procedure if you are not careful.
Some notebooks such as IBM’s ThinkPad render useless when the BIOS password is being tried to reset.
Don’t just start pulling jumpers on the motherboard. Make sure you know where it was and in what position in case anything goes wrong put it back.
If you turn your computer on and it makes strange noises / beeps, you should contact the vendor, manufacture, or a tech guy to fix it.
p.s. This is a advice, if you are not an computer engineer consult an technician