A method for storing boot time is performed by a computer product having a programmable read-only memory with a basic/input output system resident therein. The method includes the steps of: (A) while the computer product is in a process of booting, determining whether a command is received; and (B) storing system time information of the computer product as boot time information in the programmable read-only memory of the computer product when it is determined in step (A) that no command is received. This invention takes advantage of the tendency of consumers to not boot the computer product in the event of malfunction. When the malfunctioning computer product is sent to a service center, the repairperson can determine whether the computer product broke down within a warranty period based on latest boot time information stored therein, rather than based on the claims of the consumer.