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  • Is the computer's PSU an automatic switching model or does it have a manual switch on the back for changing voltage? If it's not auto switching and it got the wrong voltage then I would expect it to either shut off or go bang. Try checking your CPU status to verify clock/voltages using I-Nex or something similar in case something screwed up the BIOS and caused it to underclock.
    – James P
    Commented Jan 13, 2015 at 10:08
  • 1
    In fact, you could try just restoring the BIOS to defaults to be sure.
    – James P
    Commented Jan 13, 2015 at 10:14
  • the psu has a manual voltage change. Yet as i stated, it is still working fine. It was set to receive 220 volts, but got 110, so I think going lower did not damage it. Higher, yes, It would go bang. In the Bios the clock is the same as before, so that looks fine.
    – Blaine
    Commented Jan 13, 2015 at 10:16
  • 1
    Have you checked the temperatures? I'm wondering if someone was messing around with it for a laugh, and as well as plugging it into the wrong voltage they did something else like loosen the heatsink or stick something in the fan to stop it turning. That could cause extreme slowdown. That I-Nex program I mentioned could be useful for checking.
    – James P
    Commented Jan 13, 2015 at 10:40
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    Thank you, you have just helped put Leonard back in a classroom sites.google.com/site/techforteachinghome/leonard
    – Blaine
    Commented Jan 13, 2015 at 11:01