Resetting the CMOS
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Unplug PSU power cable from wall, this ensures no power is going to the PC.
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Remove CMOS battery. This is a small ‘watch battery’ in your motherboard (see below)
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Press and hold PC power button for 30 seconds, this clears out any remaining charge in your PC.
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Reinsert the CMOS battery, reconnect power and try starting the machine.