A method for starting a computer, comprising the steps of: powering on the computer; starting a
timer; selecting a main
BIOS chip through a selection circuit connected to the
timer; detecting whether the main
BIOS chip can pass through the main
BIOS chip within the time set by the
timer; The BIOS program is guided into the
operating system, if so, the timer is turned off, otherwise the secondary BIOS chip is selected by the selection circuit chip, and the
system is triggered to restart, and the
operating system is guided into the
operating system by the BIOS program in the BIOS chip. The above method can automatically switch to
booting the operating
system from the BIOS chip when the main BIOS chip fails to start normally, without manual intervention, and realizes unattended
system application. In addition, a BIOS automatic
recovery circuit used in the above method for starting a computer is also provided.