I am troubleshooting my home PC, it is failing but I can not find souce of the problem.

  • Mobo: GA-890GPA-UD3H (rev. 2.0)
  • CPU: AMD Phenom II X6 Black Edition 1090T, 3616 MHz (18 x 201)
  • Graphics: NVIDIA GeForce GTX 460
  • HDD: WDC WD5000AAKS-00UU3A0
  • PSU: Thermaltake Evo Blue 550W
  • RAM: Kingston 9905471-001.A00LF (2GB x 2)

The mobo manual has no information about 1 loud and non-stopping buzz sound (it's souns more like buzz then beep) seems not common situation. (sound coming from mobo speaker)

So it makes this noise and everything just freezes during this noise. This noise may or may not randomly stop. If it stops then everything unfreezes and windows continue regular work

  1. checked HDDs, replaced one because of to many bad sectors, but second seems fine. It has some bad sectors, but just 0.2%

  2. Tested some components with heavyload and furmark, everything seems fine under heavy resource load

I can not simulate this loud buzz noise behavior, it happens just randomly.

Sometimes computer refuse to turn on after rebooting after that sound - POST is silent. Just have to wait a bit before turn all back, then POST produce 1 short sound indicating all is fine and load BIOS and OS

Help me understand what should I try to figure out what's going on

  • Where is the noise coming from? 'In the workings' or from speakers? It sounds very much like a classic overheat/under-power situation; but the qualifier would be that you have some sound source running when it happens & what you are actually hearing is a very short repeating burst of the last 0.01s of what was playing, over the speakers [too short to identify] – Tetsujin Dec 19 '16 at 19:12
  • noise comming from motherboard speaker. Yes, seems like 0.01s repeated beep, but no such beep code in manual – Ekaterina Dec 19 '16 at 19:42
  • Then investigate overheat/under-power. Strip & clean would be first thing to try; assuming you have no means to measure your PSU's output under load [which is not the same as not under load. – Tetsujin Dec 19 '16 at 19:43

My under informed opinion is that you have a power supply problem. If you can find a PSU that is known working that would be my first stop. You might also try removing your video card and see if the same problem occurs.

At this stage you are likely in a remove as much as possible and then add back components until the problem reappears.

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