Windows 8 and 8.1 Forums

Self Built PC Power Issue

  1. #1

    Posts : 7
    Windows 7 64-bit

    Self Built PC Power Issue


    I'm having problems with my self built PC. Basically, it won't switch on and i'm worried that something has shorted out and damaged my PC. I've had no problems with powering up my computer before this.

    I have been having trouble with my SSD though, so I bought a new one. I removed the old SSD and fitted the new one. Whilst I had the case open, I noticed an additional SATA data and power cable that I was using to diagnose problems with the old SSD. I removed both of them and moved the power cables to the PSU along so that there were no empty sockets between the connections. I closed the case and plugged the external power cable and all of the peripherals back in as normal. However, when I switched the tower on, the power light lit up briefly then went out. I checked if the internal power connectors were in securely and they seemed to be. I tried to switch it on again and all I got was a low click then a brief whirring noise. The power light did not switch on.

    I opened the case again and found that the internal power cable for the main part of the motherboard was loose. As a precaution, I reseated all of the power cables that went into the PSU and checked that all of the connections to the components were secure. I also checked the power button connection to the motherboard. I still only got the click then whirring noise when I switched the tower on. I've also checked the power cable that goes into the case, and it's fine.

    What can I do to diagnose what's wrong my PC and how much damage could I have caused to it? Please help!

      My System SpecsSystem Spec

  2. #2

    Posts : 65
    Viewing through Windows 7, me like-a-discuss 8 though

    Could actually be a faulty psu. The symptoms you make-a describe are typical of that.

    Borrow, beg, steal or buy (or make-a) new psu and try.

    If no possible, take all component out and rebuild from a scratch-a. Even board of mother a too. Turn on with only bare minimum and make-a test. Keep going until you make-a problem. If no make-a problem, have make fun.

    Make-a sure board mounted nice in case like maker book say to. Sometimes no plastic washer is good, sometime they make-a good, depending on board.

    Important to also make-a check that no single ting overclockified.
      My System SpecsSystem Spec

  3. #3

    Maryland USA
    Posts : 746
    Windows 8 & Windows 7 Dual Boot

    Disconnect all devices inside, remove sata cables from the motherboard

    turn it on, does it stay on? power off >> unplug >> connect devices one by one until the system does not stay on.

    Does it not come on? Whats the wattage of your power supply? 350 400 500 watts?

    Does your video card require an extra power cable?

    Look on the motherboard for an extra power connecter near the processor.

    On a recent pc build, I missed one and got scared when the pc did not boot!
      My System SpecsSystem Spec

  4. #4

    Posts : 7
    Windows 7 64-bit

    Thanks for the replies.

    I've actually RMA-ed my PSU and have got a new one. I'm still having problems though!

    This time the tower shows no sign of power once switched on. I've re-seated all of the power cables and checked the motherboard connectors for the On/Off button. I've even used two separate power cables for the video card rather than use one split cable. None of this has made a difference though. I know about the power connector near to the processor. I had that same problem when I first put my PC together!

    I actually have a PSU from an old Dell Dimension 8400, but I don't know what I would have to do to fit that though.

    I'm thinking that this new PSU is completely dead.

    What does anyone else think?
    Last edited by Polygone; 29 May 2013 at 14:36.
      My System SpecsSystem Spec

  5. #5

    Maryland USA
    Posts : 746
    Windows 8 & Windows 7 Dual Boot

    remove the power cables from the video card both of them if there are 2

    remove the harddrive cables from the motherboard

    disconnect all external cables except for the power and video

    turn it on, see if it boots..

    also, on the outside of the power supply where the input power cable connects there is a flat switch that set the voltage, check to make sure its set for 115/120 and not 220/240
      My System SpecsSystem Spec

  6. #6

    Tried running it with only the motherboard having power? If it boots, then start plugging stuff in one by one and turning on after each device is connected to see if its boots. Continue till it refuses to boot, and there's your problem..
      My System SpecsSystem Spec

  7. #7

    Posts : 7
    Windows 7 64-bit

    I've tried running my PC with only the motherboard components, not even the case fans, and it didn't make a difference. I also tried each configuration of the power switch and still nothing.

    Am I supposed to be testing it by seeing if it produces an image on my monitor? I ask as the only front panel connectors I left plugged into the motherboard were for the main power switch, not even the LEDs.

    Brooklyn567, I don't have a flat switch on my PSU, at least not one that I can see. It is a modular PSU though. I'm not entirely sure what that means though, as I built the PC from a magazine's recommendation.

    Any ideas where I should go from here?
      My System SpecsSystem Spec

  8. #8

    Maryland USA
    Posts : 746
    Windows 8 & Windows 7 Dual Boot

    Could be a bad power supply, a bad power cable/outlet to the power supply..

    Does your power supply have a main switch on the back? If its in the ON position then put it in the OFF position then hit the front power button.

    do you see capacitors puffed up or leaky like these on your motherboard?

    Can you send us a picture of your motherboard? and the back of the power supply whyere your main power from the wall connnects to?
    Last edited by Brooklyn567; 31 May 2013 at 20:35. Reason: typo
      My System SpecsSystem Spec

  9. #9

    Posts : 7
    Windows 7 64-bit

    I've attached the photos you wanted to this post. The first one shows the back of the PSU as it sits in my case. The second one shows the motherboard with only the CPU, RAM, case power switch and the motherboard power leads installed.

    Since my last post, I had my PSU checked by some guys at a shop that I go to. They used a PSU tester and told me that the PSU is fine. They gave me a bit of advice as well. Here's what I've done so far:

    In the state as seen in the photos, using the on-board graphics and alternating between using one stick of RAM at a time, it would not boot. Nor did the CPU fan spin up. I also waggled the 12V plug that goes into the motherboard near the CPU and still no joy. I've also reset the CMOS values and still nothing. (Please note that each time I was alternating between the sticks of RAM I was using the primary memory stick slot in the motherboard.)

    It was also suggested that I remove the motherboard from the case, lay it on a wooden table and try the above method again to see if it's contact with the case that is short-circuiting it. I haven't tried this though as the guys said that it was "clutching at straws" and I can't remember disturbing the motherboard.

    I tried pressing the front panel power button while the switch of the PSU was set to off. Is this to check if there's a current flowing even when the front panel power button is off? If so, there is, because it came up on the PSU test.

    The capacitors on the motherboard all seem fine btw. Nothing seems to be puffed up or leaking.

    The guys in the shop said that if I get to where I am now, that it's time to start RMA-ing. Does anyone have any last pieces of advice though?

    P.S. Does the way the front panel power button connector plugs into the motherboard make a difference to whether the PC will boot? I remember alternating which round it went but not if I did it for each stick of RAM in the primary slot. Does the arrow on the back of the front panel connector means that connector into the "+" on the motherboard?
    Attached Thumbnails Attached Thumbnails photo.JPG   mobo photo.JPG  
    Last edited by Polygone; 06 Jun 2013 at 15:04. Reason: Forgot to mention the mobo capacitors
      My System SpecsSystem Spec

  10. #10

    Sydney Australia
    Posts : 2,941
    Windows 10 Pro 64bit

    Take the two leads from the start switch to the motherboard off.
    Get a flat screwdriver and touch the two bare contacts for just 1 to 2 seconds.
    This will tell you if you have a problem with the start switch and wires.
      My System SpecsSystem Spec

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Self Built PC Power Issue

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