SMPS Problem, Starts up for a moment, then stops

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shantanuthatte

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Feb 19, 2013
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Hi,

I have:
SolidGear 400W (80+ Bronze)
AsRock FM2A88X-ITX+ with AMD A4-4000
3x WD Green 3 TB
1x Samsung EVO 840 120GB
Kingston HyberX Blu 4GB

All in a ITX box. So in short, my PC wont start. No bios, no POST messsages, nothing.

So I started troubleshooting,

  • - The lights (on the cabinet) glows for a moment (less than a second) and then stops.
    - The fans also start (or should I say, start to move and everything shuts down).
    - My usual suspects were, loose connections, RAM problems, so disconnected everything and connected back. Still no success.
    - Now I disconnect all peripherals, except RAM, and the SSD, again it fails.
    - And yes every time I press the power button and it starts for a second, I have to remove the power cord, plug it back again to try again because it wont start again if I press the power button again.
    - No I start concentrating on the power supply, I try the paper-clip test by connecting the green wire to ground (black wire), again same, starts for half a second then stops.
    - I test the voltages with a multimeter, green is at +5V and so is the +5V standby.
    - I try again with multimeter connected and shorting green and ground, I am able to read voltages, +5V, +12V, -12V, but for this I have to quickly short green and black wires. But the strange thing is I dont have to disconnect the power cord to start it again.
    - I test the Power Good (grey) wire, and it is feebly on (0.03V v/s 0.00V when off).

So, can say that the power supply is broken, or is there something wrong with the motherboard?
I am able to read voltages, so its working, the SMPS fan also stats spinning whenever its on.

Any thoughts?
 
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cin19

cin19

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Mar 14, 2011
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After to clear the CMOS by removing the battery, then disconnect all peripherals, try to boot the PC, if you can't boot try other PSU if you have one. If you can't boot even use other PSU ( make sure it works), then maybe the MB/CPU is defective. If you can boot, but get the error measgae, then put back the other components one by one, like RAM, SSD, HDD.
 
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