System powers off and on when pressing power button

[kyrcy]

Shutting down windows powers off the system. Shutting down windows by pressing the power button powers off the system. Pressing power button from "DOS" powers off the system but it powers on after a few seconds. All bios power saving settings are disabled and the setting to instantly power off when pressing the power button is enabled. I tried a different power supply unit but it behaves the same. Does anyone have an idea of the cause of the problem before replacing the motherboard or case?

[jagabo]

What exactly is the question?

[kyrcy]

What exactly is the question?

Why when pressing the power button the system powers off and then on?

[jagabo]

It's likely something like Wake-on-LAN or some other BIOS wakeup (USB, mouse, keyboard, etc.) option.

[kyrcy]

I disabled everything that could wake up system in bios.

[jan5678]

most likely a power on event in bios like power on keyboard.
Shutting down in dos with the power button should behave like windows, so it must be a bios issue.

Try to reset bios to factory settings and disable any event that might wake up the pc.

Also check the power button settings in bios

[kyrcy]

Already done all these.

[jan5678]

mmm strange

In dos if you press and hold the power button until the pc shuts down, will it stay off?

[JVRaines]

Could be a bug in the BIOS. Install the latest version if you don't already have it.

[Cornucopia]

Most modern BIOSes allow you to choose what the power button is meant to do (this can also be accessed from within many OSes).

Update the firmware?

Scott

[kyrcy]

mmm strange

In dos if you press and hold the power button until the pc shuts down, will it stay off?

The PC shuts down almost instantly and if I keep pressing the button it stays off, but if I release it then it powers on.

[kyrcy]

Most modern BIOSes allow you to choose what the power button is meant to do (this can also be accessed from within many OSes).

Update the firmware?

Scott

I have the latest bios installed. There are two choices for the power button, to instantly power off by pressing and to power off after pressing for 4 seconds. In both cases the system powers on after power off.

[JVRaines]

I'm voting for a hardware problem with the switch.

[LMotlow]

Say, thanks a million for telling us what version of Windows you're using.
I think Windows is protecting you from yourself. Turning of the OS by hitting the power button is not a safe way of shutting down Windows. For normal shit down you should be using the normal "Shut Down" procedure to prevent file corruption. Apparently your OS is set to use the power button for a reboot by default. If you continue to shut down the OS by cutting power you'll end up back here complaining that your system is screwed up and won't start, in which case you'll likely be ignored.

[roma_turok]

Maybe power button not working properly
try test by disconnect all USB, LAN cable, mouse, keyboard ...
only power connected to power supply
remove connector of power button the POWER SW from motherboard:


Now short POWER pins on motherboard with screwdriver to power on/down
same problem?

[JVRaines]

Say, thanks a million for telling us what version of Windows you're using.
I think Windows is protecting you from yourself. Turning of the OS by hitting the power button is not a safe way of shutting down Windows. For normal shit down you should be using the normal "Shut Down" procedure to prevent file corruption. Apparently your OS is set to use the power button for a reboot by default. If you continue to shut down the OS by cutting power you'll end up back here complaining that your system is screwed up and won't start, in which case you'll likely be ignored.

I think "for normal shit down" all kyrcy has to do is come here and read churlish posts like this one.

Unless you're a poor soul running Windows 95 or earlier, the system intercepts the hardware Power switch and safely shuts down/sleeps/restarts as configured by the user.

[kyrcy]

Say, thanks a million for telling us what version of Windows you're using.
I think Windows is protecting you from yourself. Turning of the OS by hitting the power button is not a safe way of shutting down Windows. For normal shit down you should be using the normal "Shut Down" procedure to prevent file corruption. Apparently your OS is set to use the power button for a reboot by default. If you continue to shut down the OS by cutting power you'll end up back here complaining that your system is screwed up and won't start, in which case you'll likely be ignored.

Windows 7 but what does it matter? I am not using the power button to shut down windows but I am using it occasionally when I boot in "DOS". I don't think there is a way that the "OS is set to use the power button for a reboot by default".

[LMotlow]

Tell you guys what. I make some $$$$ every year on the side and under the table repairing OS's used by people who shut down the way you are. I'll stick with my extra income and bypass you two jerks. You and JVRaines can help each other clean up the mess.

[TimA-C]

Tell you guys what. I make some $$$$ every year on the side and under the table repairing OS's used by people who shut down the way you are. I'll stick with my extra income and bypass you two jerks. You and JVRaines can help each other clean up the mess.

I do it over the table, and with all the "recent" versions of Windows (certainly from Vista onwards) pressing the power button whilst in Windows will do as JVRaines suggests - by default it usually puts the PC/Laptop to sleep. It only "cuts power" if you've got a problem with your system or you hold the power button down for more than a second or two. (If you're using a REALLY old case which doesn't conform to the ATX standards, then I guess the power switch would "cut the power" as they used to switch the mains power to the power supply.)

[LMotlow]

You guys keep right on trusting your mobo's and system setups to do it the right way, and I'll just keep collecting the extra pay. I'm fond of the putting to sleep bit, which doesn't clear memory and nets me $50 on a 15-minute house call to somebody who's been closing down that way for 3 months and can't figure out why they're systems are so slow. That alone has bought me several backup hard drives and a lot retail movies.

[kyrcy]

This topic is not about how to properly shut down windows but about the power button which by pressing powers off and then on the system. Even with no hard disk connected and no OS and only booting to bios when pressing the power button it powers off and then on.

[kyrcy]

Maybe power button not working properly
try test by disconnect all USB, LAN cable, mouse, keyboard ...
only power connected to power supply
remove connector of power button the POWER SW from motherboard:


Now short POWER pins on motherboard with screwdriver to power on/down
same problem?

The pins are difficult to reach inside the case and I am not sure if it's a good idea to try shortening them with a screwdriver.

[roma_turok]

I am not sure if it's a good idea to try shortening them with a screwdriver.

Examples:
https://www.youtube.com/watch?v=G4FOBL1c3pA

https://www.youtube.com/watch?v=BZqunOrUWeM

https://www.youtube.com/watch?v=-ewkjDf4bZM

[LMotlow]

This topic is not about how to properly shut down windows but about the power button which by pressing powers off and then on the system. Even with no hard disk connected and no OS and only booting to bios when pressing the power button it powers off and then on.

Exception noted. If you're looking for clever ways to make something less than what it should be, you've come to the right forum.

[redwudz]

You can also switch the reset switch terminals for the power switch terminals on the MB. They are both momentary switches. I've had the switches fail.

The screwdriver trick is safe. Those terminals are all at logic levels and you are just bringing one to ground,
the same as the switch does.

But your problem may also be a software one where the shutdown cycle is hanging and the PC reboots.
One of my servers will only shut down with the power switch held down.

Software shutdowns or sleep causes a reboot with the server.
I haven't bothered to fix it yet as it takes a bit of research to find what program is hanging.

[raffriff42]

Guys I think he's pressing reset, not power...that's why the computer restarts after releasing the button.

[Marsia Mariner]

Windows 7 but what does it matter? I am not using the power button to shut down windows but I am using it occasionally when I boot in "DOS". I don't think there is a way that the "OS is set to use the power button for a reboot by default".

There is no 'DOS' inside Windows 7.

[raffriff42]

There is no 'DOS' inside Windows 7.

Correct, but maybe he's booting to the command line.

[kyrcy]

Guys I think he's pressing reset, not power...that's why the computer restarts after releasing the button.

I think I can distinguish the difference between the power and the reset buttons.

There is no 'DOS' inside Windows 7.

Correct, but maybe he's booting to the command line.

Yes.

[raffriff42]

I think I can distinguish the difference between the power and the reset buttons.

Okay, maybe the power and reset buttons are not connected to the motherboard correctly, so that pressing "Power" activates "Reset."

Take a look at post #15 again - the "PW" and "RES" connections are small and located close together; a mistake could easily have been made.

Maybe power button not working properly
try test by disconnect all USB, LAN cable, mouse, keyboard ...
only power connected to power supply
remove connector of power button the POWER SW from motherboard:


Now short POWER pins on motherboard with screwdriver to power on/down
same problem?