desktop just died, need help troubleshooting

Discussion in 'General Hardware' started by sean.ferguson, Sep 21, 2010.

  1. sean.ferguson

    sean.ferguson Moderator Folding Team

    Messages:
    1,693
    Location:
    Fife; Scotland
    My main desktop has just died.

    I am getting no response from the power button at all.

    I have checked the power cable itself on a dell optiplex system i have lying around, powers that system up fine.
    I have plugged a usb light/fan into the troubled desktop and the fan and light both work via USB on the Motherboard, so surely that means that the power supply is fine and the motherboard is fine too right?

    Im going to try and find the power switch cables to see if there is any connectors that seem damaged or unseated.
    (powerswitch cables appear fine)

    Any other suggestions / help would be greatly appreciated.

    Motherboard: ASRock 4CoreDual-VSTA
    Processor: Intel Core 2 Duo E4300 1.80GHz (i think)
    PSU: Casecom Model: ATX-350W

    :cry:

    [edit] Also disconnected the DVD-RW drive and the SATA Harddrive and still nothing
     
  2. Xie

    Xie - geek - Subscribed User Folding Team

    Messages:
    5,275
    Location:
    NY, USA
    First off I would suspect the power supply. The fact that it can power USB fans/lights off mobo doesn't mean that it is feeding the correct voltage/amps off of all the rails. The problem is that Dell uses a proprietary power supply so if you try one one off the shelf you'll fry stuff.


    * I'm drunk so I'm of no further assistance. :)
     
  3. LeeJend

    LeeJend Moderator

    Messages:
    5,291
    Location:
    Fort Worth, TX
    Somewhere in here I posted a step by step trouble shooting process. Short form follows:
    1) Unplug everything, LAN, Printers, power supply. Wait 30 seconds and reconnect the power supply.
    2) Hit the power switch and see what happens.
    PSU and CPU Fans Spin - power switch is good and PSU may be good.
    -- If fans stop after 10sec or more the CPU heatsink may be loose.
    Keyboard lights flash - indicates the CPU and part of MB is good and running self test
    Speaker beeps - the beep codes ID the exact fault, google it for your MB/Bios
    HD light starts flashing - RAM and MB good, system trying to boot
    Monitor pops or crackles and it's power light flashes or is yellow - video card issue
    Monitor light comes on steady green - video card probably ok, may be dead monitor

    Search for my long form procedure it has much more detail.
     
  4. dreamliner77

    dreamliner77 The Analog Kid

    Messages:
    4,702
    Location:
    Red Sox Nation

    I'd also suspect the PSU. And don't worry, Dell hasn't used proprietary PSU's in years (unless they recently started again).
     
  5. sean.ferguson

    sean.ferguson Moderator Folding Team

    Messages:
    1,693
    Location:
    Fife; Scotland
    hmm, done a few more tests and so far my PSU has crackled, fizzed and popped and now all i can smell is fish :/ looks like i may need to get a new PSU :/

    Im going to try and do a more time intensive, and thorough test tonight with my brother-in-laws PSU and check the other components. Thanks for the input guys :)