Check if the system just froze. If the cursor moves when using a touch pad or a USB mouse then there may be a physical connection to the keyboard that has gone bad. Check also if there are specific keys that may have gone bad it could be bad contacts underneath the keys that may just need cleaning or bad connections underneath. Underneath the keyboard there should be a line that connects the keyboard to the motherboard. It may have come loose or the connections may have gone bad.
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