![]() IBM Thinkpad laptops lock the hard drive as well as the BIOS when the supervisor password is set. Note: Removing the battery to reset the CMOS will not work for all PC’s, and almost all of the newer laptops store their BIOS passwords in a manner which does not require continuous power, so removing the CMOS battery may not work at all. Another option may be to remove the CMOS chip from the motherboard for a period of time. Unsoldering the battery incorrectly may damage your motherboard and other components, so please don’t attempt this if you are inexperienced. Some batteries are actually soldered onto the motherboard making this task more difficult. (Along with any other machine specific settings, so be sure you are familiar with manually reconfiguring the BIOS settings before you do this.) Some manufacturers backup the power to the CMOS chipset by using a capacitor, so if your first attempt fails, leave the battery out (with the system unplugged) for at least 24 hours. If you unplug the PC and remove the battery for 10-15 minutes, the CMOS may reset itself and the password should be blank. The CMOS settings on most systems are buffered by a small battery that is attached to the motherboard. ![]() If it has, turn the computer off and return the jumpers or dipswitches to its original position. Once you locate and rest the jumper switches, turn the computer on and check if the password has been cleared. Please remember to unplug your PC and use a grounding strip before reaching into your PC and touching the motherboard. On laptop computers, the dipswitches are usually found under the keyboard or within a compartment at the bottom of the laptop. Some manufacturers may label the jumper / dipswitch CLEAR – CLEAR CMOS – CLR – CLRPWD – PASSWD – PASSWORD – PWD. If the documentation is unavailable, the jumpers/dipswitches can sometimes be found along the edge of the motherboard, next to the CMOS battery, or near the processor. The locations of these jumpers / dipswitches will vary depending on the motherboard manufacturer and ideally you should always refer to the motherboard or computer manufacturers documentation. Many motherboards feature a set of jumpers or dipswitches that will clear the CMOS and wipe all of the custom settings including BIOS passwords. Press both mouse buttons repeatedly during the boot Motherboard “Clear CMOS” Jumper or Dipswitch settings Most Toshiba laptops and some desktop systems will bypass the BIOS password if the left shift key is held down during boot IBM Aptiva BIOS Other BIOS Passwords by Manufacturer Manufacturer Read your manufacturers documentation for the BIOS setting before you begin typing in passwords. WARNING: Some BIOS configurations will lock you out of the system completely if you type in an incorrect password more than 3 times. These passwords are case sensitive, so you may wish to try a variety of combinations. ![]() Many BIOS manufacturers have provided backdoor passwords that can be used to access the BIOS setup in the event you have lost your password. IBM PS/2 BIOS: Ctrl-Alt-Ins after Ctrl-Alt-Del.Phoenix BIOS: Ctrl-Alt-Esc or Ctrl-Alt-S.To enter the BIOS Setup try these keystrokes: However, there are a few known backdoors and other tricks of the trade that can be used to bypass or reset the BIOS password on most systems. Sending the unit back to the manufacturer to have the BIOS reset can be expensive and is usually not covered in an a typical warranty. BIOS passwords can also be a liability if a user forgot their passwords, or if a malicious user changes the password. BIOS passwords can be add extra layer of security for desktop and laptop computers, and are used to either prevent a user from changing the BIOS settings or to prevent the PC from booting without a password.
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