Have you tried a cold boot? Unplug the computer from the wall (or turn the switch on the back of the power supply off) for a minute. Then turn it on again.
If that doesn't work, try pulling out the CMOS battery for 20 minutes. It's a watch battery looking battery on the motherboard. Be careful when you remove it. It's held in with cheap little clips. Don't forget to touch the chassis of your computer before you touch the motherboard to release any static electricity and turn the power supply off or unplug the computer before you open it.
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