Remove the application installed on the motherboard battery the battery providing power to the chip, which stores the record the current BIOS settings. This is the most radical and reliable method, but it requires physical rather than software manipulation, so first you will have to shut down the operating system, turn off the computer, remove the side panel of the system unit and look on the motherboard that the battery ("tablet"). Do not rush to install the battery back - for greater certainty usually recommend about five minutes to wait and then do all of the manipulation in the reverse order.
Reset the factory setting of the BIOS by using the appropriate jumper on the motherboard - this option can replace the above-described manipulation with the battery. This, too, will need to obtain immediate access to the "innards" of the computer, removing one of the panels (most commonly the left) of his body. Search jumper near the battery next to it on the PCB needs to be etched inscription CLR_CMOS or CCMOS. Moving the jumper to another position and you will return to the original BIOS settings.
Use the reset function of the BIOS provided in the control panel, this basic system input/output. To do this, initiate the restart procedure of the host operating system and log in to your BIOS settings - usually this is done by pressing the Delete button during the boot process, but depending on the version it could be F1, F2, F10, Esc, or even CTRL + ALT, CTRL + ALT + ESC, CTRL + ALT + INS. Information about what should be done, as a rule, appears in the bottom left of the screen in English. Once in the settings panel, it is best to call the help (F1) and find the designated reset function factory settings button the corresponding record may, for example, be formulated as Load Optimal Defaults and assigned to function key F9. Pressing the right button, exit the panel, while retaining the changes.