in my opinion, dpo harddrive yan. kung harddrive yan, may error sa screen.. "no bootable device found, strike F1 to continue, F2 to enter setup utility."
pan on mo may beep sound ba? eto gawin mo, tanggalin mo harddrive, memory at mga add-in cards, tanggalin mo din battery, on mo sya gamit ang power adapter, pag ganun pa din, sa tingin ko motherboard.