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Computer won't turn on

By Dawnstar
Mar 16, 2017
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  1. So I got home from school, tried to turn on my computer but realised the power was down. So about 3 hours later, power is back. I try turn my PC on but it won't turn on, I just get really quick high pitched beeping noises coming from the power unit.

    Tl;Dr Computer won't turn on, weird high pitched beeping noise coming from power unit.
     
  2. Cycloid Torus

    Cycloid Torus TS Evangelist Posts: 2,383   +446

    Power Unit? Power Supply Unit inside computer system case? See #2

    Power Unit? Battery Powered Uninterruptable Supply? See #1

    #1. High pitched sound from UPS - likely normal: indicating power was off, possibly needs re-charging, possibly needs reset.

    #2. High pitched sound from Power Supply Unit - likely bad PSU - do NOT open; too dangerous unless you have technical training - borrow a known good PSU and see if it works.

    If you are not technically inclined, ask for help.
     
  3. Dawnstar

    Dawnstar TS Rookie Topic Starter

    How so dangerous?
     
  4. Cycloid Torus

    Cycloid Torus TS Evangelist Posts: 2,383   +446

    Enough voltage stored in capacitors to blow you across the room and (probably) kill you.
     

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