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Most likely option: Windows records your NumLock preference in the Registry, and then flushes the Registry change to the disk (updating the NTUSER.DAT file). However, you can use ProcMon to check what actual activity is happening. (Note that it might generate disk activity on its own, and you might need to exclude a lot of processes before you can see ...


That sounds like a bad power supply. If any other component failed, the PC would typically at least stay on for long enough to attemp to boot. Try to swap out the power supply with another one.

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