everytime i open my computer, it always say "Reboot and select proper boot device or insert boot media in selected". so i always set it.. and after i use the computer, i turn it off and the next time i open it, i get that message over and over.. what could be the problem? do i have to have to change my motherboard because the technician said that my motherboard is resetting.. and if ever i change motehrboard, what brand is the best? pls help me.. thanks!