Before the main operating system is loaded, the computer is controlled by the basic input / output system - BIOS. Its firmware contains the protocols for checking the operability of devices required to start working, as well as the procedure for initiating the boot of the main OS. The computer user can make changes to these procedures, and it often happens that the results of such interventions may need to be eliminated by returning the default factory settings of the BIOS parameters.
Instructions
Step 1
Remove the rechargeable battery installed in the motherboard that provides power to the chip that stores a record of the current BIOS settings. This is the most radical and reliable method, but it requires physical, not software manipulations, so first you have to shut down the operating system, disconnect the computer from the network, remove the side panel of the system unit and find the same battery ("pill") on the motherboard. Do not rush to install the battery back - for greater confidence, it is usually recommended to wait five minutes, and then do all the above manipulations in reverse order.
Step 2
Reset the BIOS to factory defaults using the appropriate jumper on the motherboard - this option can replace the battery manipulation described above. To do this, you also need to get direct access to the "insides" of the computer by removing one of the panels (most often the left) of its case. Look for the required jumper near the battery - the inscription CLR_CMOS or CCMOS should be etched on the board next to it. By moving this jumper to a different position, you will return the original BIOS settings.
Step 3
Use the BIOS reset function provided in the control panel of this basic I / O system. To do this, initiate the reboot procedure of the main operating system and enter the BIOS settings panel - most often this is done by pressing the Delete key during the boot process, but depending on the version used, these can also be F1, F2, F10, Esc or even CTRL + key combinations ALT, CTRL + alt="Image" + ESC, CTRL + alt="Image" + INS. Information about what exactly should be pressed, as a rule, appears at the right time in the lower left part of the screen in English. Once in the settings panel, it is best to call the help (F1 key) and find the button assigned to the factory reset function - the corresponding entry can, for example, be formulated as Load Optimal Defaults and assigned to the F9 function key. By pressing the required button, exit the panel, while saving the changes made.
