All versions of BIOS have got the command which sets values to their default parameters. It is called “Load BIOS Setup Defaults” or “Load Fail-Safe Defaults”. You may reset BIOS settings by using a jumper on your motherboard. This procedure is also called “zeroing” and allows reaching the most stable system operation. Reset of BIOS settings may restore a normal computer functioning when its operation problems are connected with incorrect values of the parameters. This procedure is also necessary for BIOS update and in some other cases.
Zeroing with the help of BIOS Setup is the easiest and the most available method, but in some cases it is impossible to use it. Here are the most frequent cases:
- it is necessary to remove an unknown password for accessing BIOS Setup or for computer booting.
- a computer does not boot at all because of unsuccessful overclocking or incorrect BIOS settings.
Before opening your system block and zeroing CMOS with the help of a jumper, try one easy method supported by some motherboards: switch on the computer by holding down Insert and if your system will boot, press Delete to enter BIOS Setup and reset settings.
Almost for all motherboards, the settings may be zeroed with the help of a jumper. You may find out its location and tips on zeroing in the board manual. In most motherboards the jumper is located close to the battery and is called “Clear CMOS” (CLR CMOS).
Here is the sequence of BIOS zeroing with the help of a jumper:
- Switch off the computer and turn off the power supply from the system block.
- Open the cover of the system block and install the jumper in the Clear CMOS position for a few seconds.
- Return a jumper in its original position and turn on the computer.
Do not move a jumper when the power is on, and do not switch off the computer if a jumper is in the Clear CMOS position.