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Windows 7: PC powers back on a few seconds after I "Shut down"

30 Sep 2011   #1
Rave79x

Windows 7 Professional x64
 
 
PC powers back on a few seconds after I "Shut down"

Hi,

Just finishing a new install of Windows 7 on an SSD, with a secondary standard hard drive.

A strange problem is occurring....when I press "Shut down" in Windows, after about 3-4 seconds, the PC powers back on again.

I can only prevent it doing this by cutting the power in that 3-4 second window.

This started happening just before I began the re-installation of Windows. I had been fiddling with overclock settings in the BIOS but then I cleared the CMOS by shorting the battery terminals. I assume this completed given that it prompted me to enter the date and time again.

Note that there are many threads on the Google relating to random power-downs and power up, but this occurs only after I click "Shut down".

I can only think this is a BIOS issue but I don't know which setting it could be. Apart from the boot priority I don't think I have changed any BIOS settings.

Should I try clearing the CMOS?

Anyone got any ideas here?

PC specs shown below...

Thanks in advance for any help.


My System SpecsSystem Spec
.
30 Sep 2011   #2
Schroff87

7 ultimate x64
 
 

When you cold boot does it power on by itself or do you have to press the button on your case?
My System SpecsSystem Spec
30 Sep 2011   #3
Rave79x

Windows 7 Professional x64
 
 

Quote   Quote: Originally Posted by Schroff87 View Post
When you cold boot does it power on by itself or do you have to press the button on your case?
Thanks for replying.

The mornings after its happened, I turn the power back on at the wall socket, then power on the PC using the button on the front.
My System SpecsSystem Spec
.

30 Sep 2011   #4
Schroff87

7 ultimate x64
 
 

There are usually settings like move mouse to power on computer etc, in the BIOS make sure they're disabled.

BTW just try leaving the computer alone for a minute at the time of cold boot before pressing the power button.

Also make sure the wiring in your PC is proper ... maybe something became a bit loose after SSD installation.
My System SpecsSystem Spec
30 Sep 2011   #5
BogdanH

Windows 7 HomePremium 64bit
 
 
Check PSU

Hi,

Quote   Quote: Originally Posted by Rave79x View Post
Hi,
....when I press "Shut down" in Windows, after about 3-4 seconds, the PC powers back on again.
Question: after you choose "shut down", does complete PC actually shuts down (drives, vents,etc)?
If answer is yes: After very short periode (say, less than 3sec), PC just starts running again, as if you pressed power button?
If answer is yes: I don't know what else you have done (except connecting SSD), but there's a big chance, that your power supply unit causes this (more precise, it is +5VSB line from PSU). It doesn't necessary mean, +5VSB line it's totaly broken... can be, this line doesn't conform specification 100%, which is quite common with "no-name" units (at least, it happened to me). Btw. the problem (with +5VSB) is usually not voltage, but current!
See: http://www.formfactors.org/developer...DG_rev_1_1.pdf

Bogdan
My System SpecsSystem Spec
30 Sep 2011   #6
carwiz

Windows 7 Pro-x64
 
 

Check to see if any "Wake on" settings are enabled in the BIOS. If they are, disable them. On Intel boards, these are in the Power section of the BIOS. The name and option may be similar to the following.

After Power Failure - Stay Off
Wake on LAN - Stay Off
Wake from S5 - Disable
My System SpecsSystem Spec
30 Sep 2011   #7
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Next time you shut Down, turn your mouse upside down and see if it remains off. It sounds, at least, like you enter Sleep mode and mouse "creep" is waking it right away.
My System SpecsSystem Spec
30 Sep 2011   #8
carwiz

Windows 7 Pro-x64
 
 

Here's another place to check. It sets the function of the Power Button.


Attached Thumbnails
PC powers back on a few seconds after I "Shut down"-power-switch-setting.jpg  
My System SpecsSystem Spec
01 Oct 2011   #9
Rave79x

Windows 7 Professional x64
 
 

Lots of replies - thanks so much for your help. Will update soon.
My System SpecsSystem Spec
02 Oct 2011   #10
Rave79x

Windows 7 Professional x64
 
 

Firstly, thanks again to everyone who replied.

Quote   Quote: Originally Posted by Schroff87 View Post
BTW just try leaving the computer alone for a minute at the time of cold boot before pressing the power button.

Also make sure the wiring in your PC is proper ... maybe something became a bit loose after SSD installation.
I left it for 15 minutes with power connected and then turned it on but it made no difference.

I will check the wiring again.

Quote   Quote: Originally Posted by Schroff87 View Post
There are usually settings like move mouse to power on computer etc, in the BIOS make sure they're disabled.

BTW just try leaving the computer alone for a minute at the time of cold boot before pressing the power button.

Also make sure the wiring in your PC is proper ... maybe something became a bit loose after SSD installation.
and...

Quote   Quote: Originally Posted by carwiz View Post
Check to see if any "Wake on" settings are enabled in the BIOS. If they are, disable them. On Intel boards, these are in the Power section of the BIOS. The name and option may be similar to the following.

After Power Failure - Stay Off
Wake on LAN - Stay Off
Wake from S5 - Disable
BIOS settings as follows:
  • Suspend mode: Set to "Auto" ("s1" and "s3" are available)
  • Restore on AC power loss: Set to "Power off" ("Power on" and "Last state" are available
  • Power on by: There are 5 different devices listed and each one is set to "Disabled".
Quote   Quote: Originally Posted by Britton30 View Post
Next time you shut Down, turn your mouse upside down and see if it remains off. It sounds, at least, like you enter Sleep mode and mouse "creep" is waking it right away.
I tried this also, but the PC still powered back on.

Quote   Quote: Originally Posted by BogdanH View Post
Question: after you choose "shut down", does complete PC actually shuts down (drives, vents,etc)?
All the fans do yes. It sounds just like it does when it powers off properly.

Quote   Quote: Originally Posted by BogdanH View Post
If answer is yes: After very short periode (say, less than 3sec), PC just starts running again, as if you pressed power button?
Yes.

Quote   Quote: Originally Posted by BogdanH View Post
If answer is yes: I don't know what else you have done (except connecting SSD), but there's a big chance, that your power supply unit causes this (more precise, it is +5VSB line from PSU). It doesn't necessary mean, +5VSB line it's totally broken... can be, this line doesn't conform specification 100%, which is quite common with "no-name" units (at least, it happened to me). Btw. the problem (with +5VSB) is usually not voltage, but current!
See: http://www.formfactors.org/developer...DG_rev_1_1.pdf
Whilst Nesteq are not a well known brand, I think they make high quality PSUs. I bought it from quietpc.com/uk who I know test products carefully before supplying. I cost 90+VAT in 2007 and is silent, which I think is a good sign.

However, I'm running out of ideas here so I guess it could be the PSU. Unfortunately, I don't have a spare I can try.

Quote   Quote: Originally Posted by carwiz View Post
Here's another place to check. It sets the function of the Power Button.
These are the power options I have set:
Guide Power Options and Diagnosis

So of the ideas suggested, its only the PSU (and perhaps checking internal cables again) that it could be I think.

Unless anyone can think of something else?
My System SpecsSystem Spec
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 PC powers back on a few seconds after I "Shut down"




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