Solved Tweak BIOS to allow PC to Boot without pressing power button

February 5, 2013 at 03:04:29
Specs: Windows XP, P4, 1GB
I came across a situation where PC powers up with no switch pressed. When there is power on the cord, it just fires up! Is there a setting in the BIOS to allow the normal use of On/Off switch?
I suspect something with the S1/S3 settings but I'm not sure...

Thanks (once again)

See More: Tweak BIOS to allow PC to Boot without pressing power button

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February 5, 2013 at 03:30:58
The 'S' settings only affect how the PC powers off, not how it starts up.

The only setting in the BIOS I'm aware of that can make the PC start up without pressing the power button is the option to power up by pressing an assigned key on the keyboard (that's what I've set my PC to, since it saves me having to bend down to reach the system case button (I'm disabled).

If your PC is starting up on it's own I would say the PSU is faulty or the power button is faulty.

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February 5, 2013 at 05:22:37
Try disconnecting the power button from the motherboard.
If the funny behavior stops, it suggests a short in the power
switch or the wires.

-- Jeff, in Minneapolis

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February 5, 2013 at 07:20:53
✔ Best Answer
It's not the power button. There's a BIOS setting for what to do after a power failure. The wording is different from BIOS to BIOS. You apparently have your system configured to "power on after failure".

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Related Solutions

February 5, 2013 at 07:44:10
Rider has the right answer. It is a facility that is normally only found on high-end computers that are likely to be used as unattended servers.

In the event of a power failure it allows the computer to re-boot when power is restored without any human intervention. As Rider says, it can be turned off if you don't want it, it is just finding the right options. It is usually off be default.


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