Question about Silverstone SST-ST405 (SSTST405) 400-Watt Power Supply

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No Power I have a two year old Silverstone SST-ST405. My Silverstone system had intermittent lock ups and then no start up. I have VOM'ed the ATX and Molex plugs and I do not see any DC voltage. Any ideas?

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  • Mark Hughes Jun 22, 2008


    The jumper proved the PSU ok. I have voltage at the plugs. So,... it appears to be a motherboard or CPU problem. How do I tell which is the problem?



  • Mark Hughes Jun 25, 2008


    Nice Avatar name. The PC does not boot. The GA-K8NF-9 MB does not show any visible signs of burn. The Athlon 64 3500+ is covered by a SilverStone Nitrogon SST-NT03 cooler. I haven't dismantled that yet. One step at a time.

    Thanks for your help!




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Dear Sir,

I assume, you have voltmeter with you.
Set VOM to DC 20 V range.
Remove the Power Supply from cabinet. Be sure you have proper earth in your house/workshop.
On the 20/24 pin main connector of your power supply, short the pins carrying green & black wire.
Hook your voltmeter -ve on any black pin of the connector permenantly.
& then connect the mains power cord to your power supply.
If your power supply is ok, this shall start the fans of the power supply on & running. Now you can check the voltages on different pins. There is a sticker on your power supply showing the normal voltages on every wire.
If you don't see any / normal volatges, your power supply needs repairing. You can buy a new one/ repair existing.

Posted on Jun 22, 2008

  • Anand Salunke
    Anand Salunke Jun 23, 2008


    Please tell me whether your PC boots up/ not? to help you further.

    If the system restarts again & again, Maybe the Electrolytics in your PSU started swelling (i.e. Failing)/ Same can happen on your Mobo..

    Have a close examination of mobo electrolytics & PSU electrolytics for this..

  • Anand Salunke
    Anand Salunke Jun 27, 2008

    Dear Sir,

    Try Following in the same sequence
    1) Check your PSU by connecting it to another working Mobo. This is because your PSU may be showing all volts right but may be sagging under load..
    2) If you are confident that PSU is ok. Try following
    a.Remove all Peripherals & all drives from mobo. Try Reseating the RAM & Power Connectors on mobo.
    b. If above doesn't help then turn off power, unplug the power cord. Remove the Battery on mobo carefully & keep it aside for about 10-15 minutes. Re-install the battery & wait for another 10-15 minutes before plugging the power cable. Check the CMOS clear jumper is not coonected.
    c. Remove the RAM. Clean its contact with a soft & good quality pencil eraser. Turn on mobo without RAM & check if it gives you the beeps. If it does so, its sign of good bios & maybe a good mobo.
    d. Re-install the RAM & check whether mobo boots.
    e. if still no success, then try changing the RAM with a working/ new one.
    f. Check whether the monitor is ok
    g. Remove the CPU fan & CPU from its socket carefully. Check the thermal heat sink is not dryed/ hardened. If so, apply fresh heat sink. Install CPU & Fan & try again.
    h. Check your CPU in another similar mobo, which can accept your CPU.
    i. If still no luck, send the mobo for repair / buy a new compatible one.



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