Announcement

Collapse
No announcement yet.

No power off

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    No power off

    My friend has a PC that has one of the strangest issues I've ever seen. He called me over today to have a look and I was basically stumped. Basically you can't turn it off whatsoever. This only happened about a month or two ago after he removed the PSU to clean it since it was clogged with dust. Once he put the PSU back in it wouldn't turn off.... meaning when you used windows shutdown, it would turn off then about 3 seconds after it would turn back on by itself. Changing to a new Delta PSU made no difference at all... so I can rule the PSU out.

    All options such as wake on LAN, wake on ring/PME is set to disabled or off. After power failure or whatever ist's called is also set to *stay off*.

    The motherboard is an Intel genuine desktop board with an 865 chipset and the CPU is an Intel Pentium 4 2.4GHz.

    I'm stumped. I think it's a hard ware issue since we even went through the effort of re-installing Windows 7 with XP etc. and that didn't change anything!

    Thanks.
    Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous
    Tags: None
    #2
    Re: No power off

    Either has Nichicon HM or has 85C 4&5mm caps and one of them is a partial short [leaky].

    .
    Mann-Made Global Warming.
    - We should be more concerned about the Intellectual Climate.
    -
    Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
    - Dr Seuss
    -
    You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
    -

    Comment

      #3
      Re: No power off

      I know someone with a Gigabyte board that does this too - 8iG1000MK so I think it's even the same/similar chipset.

      There was nothing obviously wrong when I looked at it, I think the person just leaves it on.

      If it comes back I'll replace the board in it.

      Comment

        #4
        Re: No power off

        Definately sounds like there's some issue with the motherboard. Exactly what, though, is hard to say. It could be the caps, like PCBONEZ suggested, or it could be something else.
        I love putting bad caps and flat batteries in fire and watching them explode!!

        No wonder it doesn't work! You installed the jumper wires backwards

        Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

        Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

        Comment

          #5
          Re: No power off

          shorted green pwr on wire... something might have fallen in there...

          all of the standoffs are the correct length? you could be shorting in that way as well.
          sigpic

          (Insert witty quote here)

          Comment

            #6
            Re: No power off

            I have two 8iG1000MK in stock and they don't do that.
            One did have HM and I think both had crap for 4 & 5 mm caps.

            As I said, odds are there is a leaky or partially shorted cap [probably 4 or 5 mm] that is pulling down some voltage effectively faking and locking in a WOL signal, WOR signal, or a pushed power button.
            Might also be in the 'green wire' circuit but the effect is the same.

            The delay is because the cap isn't totally shorted yet.

            .
            Mann-Made Global Warming.
            - We should be more concerned about the Intellectual Climate.
            -
            Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
            - Dr Seuss
            -
            You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
            -

            Comment

              #7
              Re: No power off

              Oh don't get me wrong PCBONEZ, this is one 8iG1000MK out of 60 or so that have been out on rental.

              Some blew their Nichion HM caps, others have Rubycon and are fine, then there's this one that has a power-off/on issue.
              It's been at least a year since the problem was reported and I would have had the machine back if it had become a bigger problem.

              Comment

                #8
                Re: No power off

                A friend had a computer that would run for a while, then reboot, randomly.

                Took a while to figure it out, but it turned out to be a bad reset button.

                In your case it might be the power-on button. Try turning the computer on, then unplug the power on button from the mobo, then shut down with windows and see if that fixes it.
                Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                Comment

                  #9
                  Re: No power off

                  Originally posted by seanc View Post
                  Oh don't get me wrong PCBONEZ, this is one 8iG1000MK out of 60 or so that have been out on rental.

                  Some blew their Nichion HM caps, others have Rubycon and are fine, then there's this one that has a power-off/on issue.
                  It's been at least a year since the problem was reported and I would have had the machine back if it had become a bigger problem.
                  I actually still have my notes on the 8iG1000MK
                  One had all KZG in VRM and MBZ for the scattered 1000uF.
                  Other had mixed HM and MBZ in VRM and HM for the scattered 1000uF.
                  Then the little 100 & 22 uF were a mix of G-Luxon, GSC, and Swcon.

                  Wanna bet your buggy board has GSC there?

                  .
                  Mann-Made Global Warming.
                  - We should be more concerned about the Intellectual Climate.
                  -
                  Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                  - Dr Seuss
                  -
                  You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                  -

                  Comment

                    #10
                    Re: No power off

                    You can bet.... If I see the PC again, I'll let you know.
                    Just remembered that a couple of the boards have baked a Rubycon below the AGP slot.

                    Apart from that, they're nice boards.
                    Last edited by seanc; 09-05-2010, 01:51 PM.

                    Comment

                    Previous template Next
                    Working...
                    X