Other Shutdown problems

Discussion in 'Hardware' started by sam12301, 19 Apr 2011.

  1. sam12301

    sam12301 New Member

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    Hi, i was wondering if someone could help me. I was playing a game when my pc randomly shutdown for no reason and now everytime i turn it on it shuts its self down. I can conclude that there is nothing overheating, iv had a fan blowing cool air on the hardware in my case. I really dont know what could be the problem.
     
  2. tehBoris

    tehBoris New Member

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    The motherboard might have developed 'expanding capacitor syndrome'. Look at the motherboard, look for any capacitors that are less cylindrical or leaking.
     
  3. Deders

    Deders New Member

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    What is your PSU, and the rest of your spec?

    I had similar problems with a no brand PSU, replaced it with a half decent one and that sorted it.
     
  4. bulldogjeff

    bulldogjeff The modding head is firmly back on.

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    Agreed. Going by the symptoms the 1'st thing I would have checked is the PSU. Its worth giving the mob a good looking over as well though.
     
  5. sam12301

    sam12301 New Member

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    Well heres my spec:
    Mobo: Gigabyte p55m-ud2
    Memory: G.Skill 4GB DDR3 1333mhz
    PSU: Corsair HX750w (i only got this about 2 month ago)
    Graphics card: Nvidia GTX 470 point of view Ultra Charged
    CPU: Intel i5 750
    CPU Cooler: Corsair H70
    Hard Drive: Western Digital Caviar Black 1TB

    As far as i can see on the mobo all the capacitors are in shape and non leaked
     
  6. Nicho133

    Nicho133 New Member

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    If you have a spare PSU laying around try using that.
     
  7. Comrade Woody

    Comrade Woody Obsolete

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    When does it shut itself down?

    Is it getting past POST, entering Windows and then falling over, or is it immediately switching itself off?
     
  8. sam12301

    sam12301 New Member

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    I dont have a spare PSU to test.
    As for the shutting down, it just shuts down randomly at different times, theres no set time it shuts down.
    Last night it stayed on long enough for me to do a memory test with Memtest 86, there was no errors.
     
  9. Comrade Woody

    Comrade Woody Obsolete

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    That's what I was going to suggest doing...

    Since the memory is okay look at other common problems that can cause shutdown.

    You've already mentioned overheating in the original post, and pretty much all the replies highlight the PSU as a possible culprit.

    If you are positive that nothing is overheating then you do need to test with another PSU.

    Perhaps you know someone who can lend you one?
     
  10. Deders

    Deders New Member

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    My old memory passed memtest no problems, but still wouldn't boot into windows. the memory diagnostics built into windows 7 and vista picked up on the memory errors that memtest didn't.
     
  11. Fizzban

    Fizzban Man of Many Typos

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    Definatly sounds like an iffy psu, though if it is only 2 months old it shouldn't be causing issues. But it's not unheard of. Is there anyone you can borrow a psu from? Also is the system overclocked? If it is try putting it back to default settings.
     
  12. KidMod-Southpaw

    KidMod-Southpaw Super Spamming Saiyan

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    I'd recommend taking all the non essential things out of the PC, switch to onboard graphics e.c.t and see what happens. Also, unplug all peripherals except keyboard and mouse. If it's still the same, you'll need another psu to test with.
     
  13. sam12301

    sam12301 New Member

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    The system is not overclocked its on stock speeds. I dont know anyone i can lend a PSU off. I i am positive that its not overheating because everything is cool. I dont understand how it could be the PSU causing my problems though. Just to let you know iv had it running without it shutting down for the past 30-40 mins.
     
  14. Fizzban

    Fizzban Man of Many Typos

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    I had a system do this once. It would sometimes reset several times a day and at other times would run fine for several days. I put up with it for a couple months till I could upgrade. Low and behold replacing the psu fixed it. I later tried the (old) psu in another system and it had gone to silicon heaven. Good job I upgraded when I did.

    Anyways try doing what kidmod suggested.
     
  15. Nicho133

    Nicho133 New Member

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    When your in Windows try running Prime 95 and Furmark at the same time, if your system frezzes or shutdowns then it's probably the PSU. and while doing those tests cheak the Voltages.
     
  16. sam12301

    sam12301 New Member

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    ok guys thanks ill try these things and report back.
     
  17. sam12301

    sam12301 New Member

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    The computer didnt shutdown or freeze whilst running prime 95 and furmark.
     
  18. Nicho133

    Nicho133 New Member

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    If your motherboard has a voltage monitor that runs in Windows, cheak the voltages, then when running prime and furmark cheak if the voltages drop down below the min range, and when stopping Prime and furmark cheak if the voltages go over the max range in the table below.

    Code:
    Supply [V] 	Tolerance 	Range (min. to max.) 	Ripple (p. to p. max.)
    +5 VDC 	        ±5% (±0.25 V) 	+4.75 V to +5.25 V 	50 mV
    −5 VDC 	        ±10% (±0.50 V) 	–4.50 V to –5.50 V 	50 mV
    +12 VDC 	        ±5% (±0.60 V) 	+11.40 V to +12.60 V 	120 mV
    −12 VDC 	        ±10% (±1.2 V) 	–10.8 V to –13.2 V 	120 mV
    +3.3 VDC 	        ±5% (±0.165 V) 	+3.135 V to +3.465 V 	50 mV
    +5 VSB 	        ±5% (±0.25 V) 	+4.75 V to +5.25 V 	50 mV
    
    The table will show up better at Wikipedia. http://en.wikipedia.org/wiki/ATX#Power_supply
     
    Last edited: 20 Apr 2011
  19. Deders

    Deders New Member

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    bear in mind that they aren't always very accurate, CPIUID's hardware monitor says that my 12v rail is running on 0.09v, and yet it's perfectly stable.
     
  20. sam12301

    sam12301 New Member

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    I think the problem could by hard drive failure, iv got my old hard drive which i know works and im using that and my pc hasnt shut its self down yet and iv had it running for about 2 hours 30 mins
     

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