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PC keeps shutting off randomly

By terry5880
Feb 22, 2014
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  1. Hi all I got custom built pc I built maybe 5 yrs ago or more had no problems till now.. yesterday it decided to just turn off and would not turn on so I opened up side casing after unplugging it then plugged back in and it came back on was on for few hours I then shut down and went to bed ..woke up this morning and it wouldnt turn on again so I unplugged and plugged back in and it worked again ..could it be psu is failing..any info please ask
     
  2. terry5880

    terry5880 TS Enthusiast Topic Starter Posts: 527

    UPDATE pc turned on fine this morning and has been on good few hours so really puzzled

    im running asus motherboard 2gb corsair ram core 2 duo cpu with nvidia 8800gt graphics card windows 7 and a 750watt psu...some one please help
     
  3. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,865   +165

    My wife's PC is doing this too. It is a MicroATX model with a 275 watt TFX power supply. I have seen this in a few more PC's over the years. It seems like a power supply issue, but it can also be the motherboard
     
  4. terry5880

    terry5880 TS Enthusiast Topic Starter Posts: 527

    Thanks tmagic always count on you to give input bud.. I think its psu too gonna format it and sell to a shop
     
  5. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,865   +165

    Okay terry5880, no problem... Good luck!
     
  6. terry5880

    terry5880 TS Enthusiast Topic Starter Posts: 527

    So far since last message been turning on and off fine so deffo got to be psu ..thanks again
     
  7. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,865   +165

    No problem, glad to help:)
     
  8. BosPatrollie

    BosPatrollie TS Member

    I have recently worked on 3 machines displaying similar symptoms ... turned out to be dust on 2 of them and a faulty capacitor on the other's motherboard. Another common issue, like mentioned already ... is the PSU. On one of the 2 dust affected machines, it was dust inside the PSU causing intermittent shorts and spikes. I advised the user to look at replacing it as chances are the short caused by the dust could very well have done some lingering damage.
     
  9. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,865   +165

    BosPatrollie,
    Dust is not an issue here. Both Terry5880 and I are smart enough to have ruled that out before changing the power supplies...
     
  10. BosPatrollie

    BosPatrollie TS Member

    Tmagic650,
    My post was not intended to offend you or Terry or question your intelligence. I merely stated what I found to be the cause there and what I advised that user to do. Someday somebody might read this thread when they browse for answers and that could very well end up being their issue. ;)
     
  11. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,865   +165

    I can imagine that you live in an area where the prevailing dust is conductive like parts of Colorado or Pennsylvania or even Kentucky. I have seen the inside of a computer so full of dust that it was like a blanket covering the entire motherboard a half inch thick. This was causing overheating
     
     
  12. BosPatrollie

    BosPatrollie TS Member

    Yeah ... overheating happens quite often is such scenarios due to the fans either not spinning properly (or at all) and the heat sinks being clogged up. Holy COW ... 1/2 inch ... that's enough dust to start a mini-green house inside the tower case!
     
  13. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,865   +165

    I changed the power supply in my wife's computer and it is shutting off and turning on normally now
     


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