The BIOS is the input and output system for a computer system. This is the first software that is run when a computer is started. Its main purpose is to start the operating system. Computer manufacturers will release BIOS updates over time to overcome errors and other problems. It is quite rare to undo a BIOS update, but sometimes the new BIOS will not fix the problem and cause additional issues. Only update the BIOS if a problem occurs and this is the recommended solution.
Restart the computer.
Hit the F2 key when the manufacturer's logo is on the screen. If you do not see the manufacturer's logo, the BIOS can be accessed by hitting the F1, F10 or DEL keys.
Highlight Maintenance and expand this menu. Select Load defaults and press enter. Press enter to continue. After changing the BIOS settings, press escape. Save and then exit the BIOS. The BIOS settings will be changed to those that originally came with the system. Depending on the system, the Load Factory defaults may be found in the exit menu or can be loaded by hitting Alt + F keys.
Shut down the computer and remove any power connections. Access the motherboard of your system. Accessing the motherboard will vary for each type of computer. Follow the instruction manual for your system. If you do not have a manual then contact the manufacturer to obtain one.
Locate the motherboard jumper pins by consulting the computer manual. Make a note of the pins that the jumpers are connected to. The default settings for these pins is typically pin 1 and 2. Write down the current placement of the jumpers.
Remove the jumper pin(s) and place it on 2 different pins--pin 2 and 3, for example. Leave the jumper on the new pins for 20 seconds. Put the jumper back on the starting pins 1 and 2. This will restore the BIOS to its default settings.
Plug the power cable back in and turn the computer on. Enter the BIOS and verify that the settings are correct. In particular, look at the hard drive type and size as well as the memory and CPU. Change these settings if necessary. Settings can be obtained by checking the AMI Bios set-up features. Save any new settings and restart the system.
Do not update the BIOS unless necessary. Before attempting to fix a problem ascertain if updating the BIOS will actually help the issue. Many times an updated BIOS will not have any effect on the current problem.