Power button will not shut down the PC

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hucker

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My physical power button on the case works fine to turn on the PC, but just recently Windows 8 is ignoring it, so I can't use it to sleep or shut down the PC. I've checked the settings in the power control panel.
 
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mjmacka

mjmacka

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May 22, 2012
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There is a setting in power options, "Change what the power button does."
The button might be set to "do nothing."
Verify that it isn't set to that.

Also, what happens if you press and hold down the power button for 15 seconds?
 
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hucker

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The setting you mention is set to "sleep". It did used to sleep. This is a new installation of a few weeks and sleep worked initially. I tried changing it to "shut down" but it still did nothing.

Holding the power button for 4 seconds cuts the power, like I would expect. It's as though Windows has lost the ability to detect the power button being pressed. Should there be something in the device manager like ACPI Power Button? I can't see one.
 
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hucker

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Ok, I must have typed too much, sending in 3 parts:

I have "ACPI fixed feature button" too, but googling that suggested it was something on the keyboard. It says it's working properly. I'll try uninstalling that and reinstalling it......

 
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hucker

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It's custom built, by myself. Gigabyte Z77-DS3H motherboard, latest BIOS and drivers, everything worked perfectly for the first week or so, then the power button stopped working for no reason. The only thing I did recently was upgrade the graphics card driver to the beta version because the current non-beta one causes bluescreens in windows 8.
 
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hucker

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There's nothing in the BIOS settings that seems connected to this problem, anyway the settings were set when I assembled it before installing Windows, and have never been altered.
 
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hucker

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Alas, it worked ONCE. I'll just have to use the menu.....

P.S. I can't reply in this thread by typing at the bottom, I have to click answer first then type in the box that appears at the top. I'm using Opera.
 
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mjmacka

mjmacka

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Well, I would run "sfc /scannow" in an elevated command prompt. This verifies that your windows system files (mostly dll's) are fine.

You could also download ccleaner, run a registry scan (make sure to back up your registry first) and then remove the ACPI fixed feature button in the bios and reboot.

It should reinstall when Windows comes back up. Then check it.
 
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hucker

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sfc /scannow produced pages and pages of "owner warnings" whatever they are. But I couldn't find anything corrupted, although the command prompt said "Windows Resource Protection found corrupt files and successfully repaired
them."

CCleaner registry scan found about 150 invalid references to files which no longer existed saying "this can happen when software is uninstalled", but nothing more serious than that.

I assume by "remove the ACPI fixed feature button in the bios and reboot" you meant "in the device manager".

Ok done all that, restarted, and as before the power button let me sleep the machine ONCE. I then tried again immediately afterwards and it did nothing. It seems I am only allowed on sleep per session?!? I can sleep fine using the menu, so it's just the button that's not being noticed, very very odd.
 
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mjmacka

mjmacka

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Sorry, I did mean device manager... late night.

Honestly, I'm at a loss as to why this seems to be per session on your PC.

You can always back up your data and reinstall your OS but that seems like too much work to me.
 
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ehuna

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The same thing is happening for me in Windows 8 - if I delete the "ACPI fixed feature button" and reboot, I can then use the power button on my Dell Desktop T3400 to make it go to sleep.

But after the second time I come back from sleep, it stops working. When I look at Device Manager > System Devices, I see that "ACPI fixed feature button" gets re-installed by Windows 8, and it stops working again - pressing the power button on my desktop does nothing.

There is no way to disable this "ACPI fixed feature button" - does anyone know of a way to stop Windows 8 from re-installing the driver?

Note: the same thing is happening in Windows 8.1 Preview.
 
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