Take out the main battery and the CMOS battery from the motherboard if it has one, hold in the power button for about 30 seconds to kill all motherboard power and reset the BIOS. Plug in main power only and see if it turns on normally.
Take out the main battery and the CMOS battery from the motherboard if it has one, hold in the power button for about 30 seconds to kill all motherboard power and reset the BIOS. Plug in main power only and see if it turns on normally.