This is for users who often encounter the error message saying 'Press F1 to start the system' when their desktop computer is booted. The only reason for this is that the CMOS battery life has expired and the CMOS option is not saved in the BIOS. It is for this reason that every time the system is turned on, it is being reset to zero. When such a situation arises normally messages of wrong configuration appear. In such a situation, it is required to change the CMOS battery of the motherboard. It is also required to select the option of 'Load BIOS Defaults' in the BIOS.