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Noise from PC after shut down system.

post #1 of 6
Thread Starter 
Hey forum. I have a question. When i turn off computer ( system close ) i am PERPETUALLY ( non stop ) hearing a noise from pc, probably from PSU. But next, when i turn off button in power strip, THEN finally maybe after 10 seconds that noise from pc is just dissapear.
Its is normal? Can somebody explain me that?
Edited by sew333 - 7/26/13 at 2:27pm
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I7 3770K 3.5 Asus Sabretooth Z77 Evga Gtx 980 2x4gb Corsair Vengeance DDR3 LP White Arctic 16... 
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post #2 of 6
What do you mean by: turn off button power in slat

Is this noise coming from the case? The speakers? What does the noise sound like?
950
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950
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CPUMotherboardGraphicsRAM
i7 950 Asus X58 Sabertooth MSI R6970 Lightning Corsair XMS3 6GB 1600Mhz 
RAMHard DriveOptical DriveOS
Corsair Vengeance 12GB 2x ST Barracuda Raid 0 Asus, LG Win 7 Pro 
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ViewSonic 19" HP w2207 NEC APC-H412 Corsair AX-850 
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post #3 of 6
Probably coming from the PSU.
post #4 of 6
Thread Starter 
Turn off button from A power strip
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
I7 3770K 3.5 Asus Sabretooth Z77 Evga Gtx 980 2x4gb Corsair Vengeance DDR3 LP White Arctic 16... 
OSPowerCase
Windows 7 Ultimate x64 XFX P1-750X-XXB9 Cooler Master Centurion 590 
  hide details  
Reply
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
I7 3770K 3.5 Asus Sabretooth Z77 Evga Gtx 980 2x4gb Corsair Vengeance DDR3 LP White Arctic 16... 
OSPowerCase
Windows 7 Ultimate x64 XFX P1-750X-XXB9 Cooler Master Centurion 590 
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Reply
post #5 of 6
If it's a high pitch squeal or ultrasonic high pitched beep type sound, it's probably the capacitors discharging after you turn the PSU off. There are some pretty big caps in most PSU to filter the A/C power and provide some power buffer for transients, and a UL listed supply will discharge those caps after power off. I'm not sure precisely "what" makes the noise, my guess is it's some coil whine due to harmonic oscillation.

Greg
post #6 of 6
Thread Starter 
( i think its fan\ fans )
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
I7 3770K 3.5 Asus Sabretooth Z77 Evga Gtx 980 2x4gb Corsair Vengeance DDR3 LP White Arctic 16... 
OSPowerCase
Windows 7 Ultimate x64 XFX P1-750X-XXB9 Cooler Master Centurion 590 
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Reply
PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
I7 3770K 3.5 Asus Sabretooth Z77 Evga Gtx 980 2x4gb Corsair Vengeance DDR3 LP White Arctic 16... 
OSPowerCase
Windows 7 Ultimate x64 XFX P1-750X-XXB9 Cooler Master Centurion 590 
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