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Thread: Pc randomly cutting out

  1. #1
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    Pc randomly cutting out

    My computer keeps randomly turning off. It can be anytime that it happens, no bluescreen or anything just off. It doesnt turn back on again untill as I (accidently) discovered you move the case slightly or knock it slightly.

    This makes me think its a hardware problem rather than anything on the computer. My best guess was a loose connection but I cant find any anywhere. Could the power switch has a loose connection? The other thing I thought was a power supply issue. My psu is a 400w ocz stealthxtreme, and I have upgraded the computer since I bought that. Could it be the psu can no longer support the hardware in there?

    Kitlist in my profile.

    Any help would be appreciated.

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    Re: Pc randomly cutting out

    Have you try using a wattage calculator.

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    no_numb (07-03-2011)

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    Re: Pc randomly cutting out

    Quote Originally Posted by cub1061 View Post
    Have you try using a wattage calculator.
    Yeah my wattage comes out at 320w recommended. So I thought it'd be fine.

    Although if I adjust capacitor aging it starts to go up. Although I'm not really sure what value to use for this?

  5. #4
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    Re: Pc randomly cutting out

    Check for anything shorting the motherboard

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    Re: Pc randomly cutting out

    depending on the PSU you can sometimes hear clicking sounds if the system tries to draw too much power - and when this happened to me I found some components kept working while others died.

    Watch the LEDs on the motherboard/ethernet port. these tend to stay on even when the system is off but plugged in. When it turns off randomly if these go out (might take a minute or two) it's a safe bet the PSU is not supplying the motherboard with power anymore.

    Also try disconnecting spare HDD + optical drives and see how the system runs with just the system drive operating.

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    no_numb (07-03-2011)

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    Re: Pc randomly cutting out

    cheers guys

    Nothing shorting the motherboard that I can see.

    Ethernet light goes off when it turns off. Also noticed when I checked it now that 2 of the fans are not working. There has been no warnings about this on the software. Guessing this means that the psu is not working very well/is being overloaded. Will try unplugging the other drives tomorrow and see if the fans run etc...

    The case is clean so its not dust clogging the fans. Looks like a psu issue.

    Any recommendations on a 600w or so psu? Nothing too expensive please!

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    Re: Pc randomly cutting out

    how are the fans powered - from the motherboard or direct from PSU?

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    Re: Pc randomly cutting out

    Quote Originally Posted by ik9000 View Post
    how are the fans powered - from the motherboard or direct from PSU?
    Motherboard. The fan at the front of the case also running from the motherboard is working though. Have not checked the fan in the psu mind.

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    Re: Pc randomly cutting out


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    Re: Pc randomly cutting out

    Quote Originally Posted by no_numb View Post
    Motherboard. The fan at the front of the case also running from the motherboard is working though. Have not checked the fan in the psu mind.
    is it running from the same header or a different one?

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    Re: Pc randomly cutting out

    ah actually not 100% sure if the front fan is on the motherboard tomorrow will check properly (in bed on the laptop). If its not on the motherboard does that mean its potentially a motherboard problem?

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    Re: Pc randomly cutting out

    well if your MOBO is losing power, the fans powered from it won't be running either. If the fans running off the PSU keep running after the shut down and the MOBO has lost its power - then you're starting to narrow down where the problem lies. It could be as simple as the MOBO not having enough power due to the PSU not being able to supply it, or it could be a MOBO fault causing something to trip.

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    Re: Pc randomly cutting out

    Quote Originally Posted by ik9000 View Post
    well if your MOBO is losing power, the fans powered from it won't be running either. If the fans running off the PSU keep running after the shut down and the MOBO has lost its power - then you're starting to narrow down where the problem lies. It could be as simple as the MOBO not having enough power due to the PSU not being able to supply it, or it could be a MOBO fault causing something to trip.
    Sorry I should clarify the front fan does not stay on after shut down and the pc will not power back on till it is nudged. It appears that the 2 fans definately off the mobo do not run at all.

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    Re: Pc randomly cutting out

    just noticed this system spec in SnootyJim's sig:

    Desktop 2 (Self-built): 7 Home, CM RC-341, OCZ 400W XStream, GA-MA785GM-US2H, Phenom X4 9600 BE, 4GB RAM, 2TB HD204UI, 32GB OCZ Onyx SSD, HP w19

    uses same PSU as you, and reasonably similar spec machine. He is complaining that the comp cuts out if he knocks it.... if his problem isn't the PSU then unless your PSU is faulty it should be able to power your rig. If his problem is the PSU then likelihood is yours is the root of your problem too.

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    Re: Pc randomly cutting out

    Quote Originally Posted by no_numb View Post
    Sorry I should clarify the front fan does not stay on after shut down and the pc will not power back on till it is nudged. It appears that the 2 fans definately off the mobo do not run at all.
    when you say till it is nudged - do you mean turned on again or just given a hit? If everything's powering down it implies the PSU is either being overloaded + tripping, or else simply turning itself off to protect itself/the system, or lastly that it is receiving a shut-down signal from the MOBO to trick it into thinking that the machine is ready to be powered-down.

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    Re: Pc randomly cutting out

    Quote Originally Posted by ik9000 View Post
    when you say till it is nudged - do you mean turned on again or just given a hit? If everything's powering down it implies the PSU is either being overloaded + tripping, or else simply turning itself off to protect itself/the system, or lastly that it is receiving a shut-down signal from the MOBO to trick it into thinking that the machine is ready to be powered-down.
    Just given a hit, first found it out when I took the side panel off and it got a jolt and started working again. Untill it is knocked the power button does not work at all.

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