PC occasionally not turning on correctly - motherboard or PSU problem?

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lolcake2012

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Apr 26, 2017
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My PC has been having trouble turning on recently with the following scenarios:
(these scenarios do not all happen on the same day)


  • - PC appears to turn on but no monitor feed (and it does not say 'No Display')
    - PC turns on and gets to bios but SSD (contains boot files) does not appear in the boot settings, only HDD
    - PC turns on and immediately off, then on and off, etc.
    - On some occasions when the PC is on and running tasks that require a bit more processing than usual the monitor goes black for a few seconds (while OS is still working).

I was suspecting it was the PSU that was failing (please correct me if I'm wrong!) - but then someone mentioned it could be the Motherboard.

During all of the above scenarios all fans are working, etc. The PC hasn't been disassembled or anything since it was built so I'm not sure the cause would be broken pins / bent stuff. Maybe a bit of built-up dust if anything.

Here are my specs (PC is about 2-3 years old I think):

  • PSU - SeaSonic G-550W
    SSD - Kingston 240G SSDNow V300 Drive
    Motherboard - H97M-ITX/AC
    CPU - Intel Core i5-4590 Processor
    GPU - ASUS GeForce® GTX 780
    RAM - 16GB
    HDD - 3TB
    Case - Cooler Master Elite 130 Mini-ITX Case

Any suggestions on figuring out the cause?

Let's assume it is the PSU that is failing - what's a good PSU replacement within $100-$150 AUD price range?

I've been looking at umart but they all look the same to me :S (Should I be getting one that is a little more than my current 550Watt one?) What should I be looking at when buying a new PSU to suit my case?

[I've followed this guide on PC components but still am unsure http://imgur.com/t/gaming/rYRa1]
 
Solution
cin19
From what you posted for the PC behaviors. The problem maybe from the MB, PSU, or oc, or even the SSD too.

May do;
1) Boot into the BIOS, in the hardware monitor section ( or something like that section: health monitor) to see the +3.3V, +5V, and +12V. You want to see those numbers are within +/- 5%. If they are, the PSU is good, otherwise the PSU has problem.
2) If you oc, and clear the CMOS by the jumper or removing the CMOS battery.
3) Take the gtx 780 out, use the intel onboard iGPU to test the PC, also test the gtx 780 in other PC, make sure the gtx 780 is fine or not.
4) Using the kingston SSD tool to check the SSD S.M.A.R.T. just make the SSD is fine or not.
5) Just use one RAM to boot the PC, also test the RAM one by one with...
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cin19

cin19

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Mar 14, 2011
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From what you posted for the PC behaviors. The problem maybe from the MB, PSU, or oc, or even the SSD too.

May do;
1) Boot into the BIOS, in the hardware monitor section ( or something like that section: health monitor) to see the +3.3V, +5V, and +12V. You want to see those numbers are within +/- 5%. If they are, the PSU is good, otherwise the PSU has problem.
2) If you oc, and clear the CMOS by the jumper or removing the CMOS battery.
3) Take the gtx 780 out, use the intel onboard iGPU to test the PC, also test the gtx 780 in other PC, make sure the gtx 780 is fine or not.
4) Using the kingston SSD tool to check the SSD S.M.A.R.T. just make the SSD is fine or not.
5) Just use one RAM to boot the PC, also test the RAM one by one with MemTest86 http://www.memtest86.com/download.htm
6) Last one, if you still can't find out the problem, go to local PC ask for help, let them test the MB for you.
 
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