As a computer hardware technician or a computer tech guy you have to consider many reasons before deiced a mother board fail.
- Check the power supply with a power supply tester.
- Check RAM cards (unplug all RAM cards and test MB with a working RAM)
- Change the BIOS Battery.
- Unplug all disk drives and devices connected to mother board and check.
- Remove the power button cable and short the power button pins on mother board and check. With a bad power button nothing will work.
- Finally change the processor and check. but remember processors burn rarely.
After the above mentioned diagnosis will not work you can decide a mother board as a failure mother board.
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