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Windows 7: W-7 will not shut down

30 Aug 2016   #21
idahjo

Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
That is now two of us anyway ;-)

Quote   Quote: Originally Posted by Holmes177 View Post
Quote   Quote: Originally Posted by idahjo View Post
Some of the suggestions elude to the 'green wire' as being the sole connection to the MOBO. If so, it has to be a control circuit allowing the MOBO to turn the PSU off and on. Got to thinking and just unplugged the 24 pin main power plug from the MOBO and the PSU still runs until it is unplugged again. To me, that would suggest the MOBO may have dodged the bullet and the PSU took it in the shorts (no pun intended)

If the PSU output voltages are present then the control circuit from the MOBO is being negated by some sort of stuck/fried relay system within the PSU. IS that possible? If so, is the MOBO not booting because it is required for the PSU to recycle as the first step of the booting process?

Realize this is getting a little technical and probably something most do not know, but I do not want to tear down another computer to substitute a 'good' PSU so will have to buy one if what I am thinking is a possibility.

Thanks a million for any and all suggestions
I agree, sounds like a bad power supply.
Inasmuch as the 24pin main power plug has the 'single green wire' in it I would think it almost has to be the PSU. Wish I knew when/how the MOBO sent the signal thru that wire to turn the PSU on


My System SpecsSystem Spec
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30 Aug 2016   #22
Ranger4

Windows 7 Home Premium 64 bit sp1
 
 

As far as I know the PSU has nothing to do with shutting down a PC. This operation is controlled by the MB.
My System SpecsSystem Spec
30 Aug 2016   #23
Holmes177

Windows 7 Home Premium 64 bit
 
 

Quote   Quote: Originally Posted by Ranger4 View Post
As far as I know the PSU has nothing to do with shutting down a PC. This operation is controlled by the MB.
True, the MB controls the power supply, but if the 24 pin connector is disconnected from the MB, and the power supply fan(s) continue to run, then that is an issue with the power supply.
My System SpecsSystem Spec
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30 Aug 2016   #24
idahjo

Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
Here is the technical answer I was looking for

My System SpecsSystem Spec
31 Aug 2016   #25
idahjo

Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
 
 
Purple wire tells the tale

My STANDBY (Purple #9 in the MOBO main power plug) is 1.74v "Should be 5v +/- 5%- If the standby voltage is not in spec or the led(s) are not lit, your PSU may be bad or the mobo may have a short.

Conclusion: Believe the PSU switching relay is shorted, and the MOBO ON SIGNAL (Green #14 in the MOBO power plug) is latched at 4.75v. Both are probably 'fried'.
My System SpecsSystem Spec
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 W-7 will not shut down




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