The above applies mainly to desktop machines...were you inquiring about a laptop? It will have a clock battery as well, but the "yank the battery" trick won't work on mobile hardware. It is still possible to do, just might want an experienced hand to assist, as it involves cracking into the laptop. Most laptop pc's have two tiny metal contacts on the board, usually situated near the RAM expansion slot. A flathead (non magnetic, of course) screwdriver is is usually sufficient to bridge the gap between the two metal points, effictively "shorting" BIOS's connection to the power source. That will cause the BIOS to reset back to factory defaults, restoring default or "failsafe" settings. On many machines this is the only way to remove a startup or BIOS administrative password. PLEASE SEEK ASSISTANCE with this, as it is incredibly easy to seriously damage your hardware while trying to crack into the case. You can, if needed find disassembly instructions for your make/model on the OEM manufacturer's support page... which should help if you absolutely have to do this yourself.
Good luck!
I'd reccomend getting a certified technician perform the task above, since improper handling can result in ESD (Electro Static Discharge), which can destroy a motherboard. (When you discharge, or shock someone by poking them, the amount of volts you discharge is about 2,000 volts, that's just the minimal to feel or see it! On top of that you only need 100 volts to damage a computer chip beyond repair.) --Source:http://hardforum.com/showthread.php?t=81...
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If you need to Reset BIOS, you may have to open up your computer. Inside there should be a button cell battery somewhere, this is what's known as a CMOS battery. (Make sure your computer is off!)
When you remove the CMOS battery, all saved settings in BIOS should reset to factory default. Another way to reset BIOS is a jumper that is located somewhere on the motherboard. (May not be existent on laptops)
Typically it will display on the screen what button to press to access the BIOS menu when your computer first turns on. You can also reference your motherboard's manual to find out ahead of time. If you don't see a message on the screen telling you which button to press, the usual buttons are F1, F2, F10, DEL, or ESC.
When your computer starts press key to enter bios. Del F1 F2 or F10 then select reset to default or factory default. If this does not help there is a jumper method in which you locate the CMOS jumper and move to the open pins on the motherboard. I.E. if pins 1 and 2 are in use cover pins 2 and 3. When emtering your case stay groind by rubbing alle metal on case them touch the CMOS jumper, pull it straight up. Or simply remove the the CMOS battery should be a CR 2032.
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