Computer boots up after shutdown

[ixelion]

When I shutdown the computer from within windows XP, the computer will shut down normally but after 1 second of being completely powered down it will boot up by it self.

The only thing different in the PC was I was recently swapping video cards, but I don't know how that's related.

I have had "auto start up" problems cause by mouse and keyboard input before and it was related to my motherboard, but I resolved those issues long ago.

When I do a hard shutdown, it doesn't start up again.

AMD Opteron 165
DFI Lanparty UT RX
4x512 Kingston RAM
2x80 GB Seagate Barracuda RAID 0
OCZ Gamestream 600W
ASUS 8800GTS

 

[akhilles]

What's a hard shutdown? Holding the case power button?

Are all wake-up settings in bios disabled? Set boot devices to non-USB/network ones. No auto boot other devices. Is sleep setting in STR/S3 in bios?

Depending on how you shut down windows, the shutdown button in start menu may be set to sleep instead of shutdown.

 

[TheKub]

Originally posted by: ixelion
I have had "auto start up" problems cause by mouse and keyboard input before and it was related to my motherboard, but I resolved those issues long ago.

Ive never heard of a PC booting on mouse\keyboard input are you sure it wasn't just a sleep?

 

[ixelion]

What's a hard shutdown? Holding the case power button?

Yes, although I would do this before Windows startup like on POST

Are all wake-up settings in bios disabled?

Yeah, I am fairly sure I disabled everything when I was trying to diagnose it myself

Is sleep setting in STR/S3 in bios?

I am not sure I don't remember seeing this in the BIOS but I will check

Depending on how you shut down windows, the shutdown button in start menu may be set to sleep instead of shutdown.

But is this characteristic of sleep mode? Normally the comp will boot when you move the mouse or something, but in my case it boots up all by itself, like an invisible hand is pressing the power button.

Ive never heard of a PC booting on mouse\keyboard input are you sure it wasn't just a sleep?

It's not sleep or hibernate it completely powered down, and power on through mouse and keyboard input is a common feature on mobos these days.

 

[TheKub]

Originally posted by: ixelion
and power on through mouse and keyboard input is a common feature on mobos these days.

Any one confirm this? I havn't built a PC since December and have NEVER heard of this.

 

[Fardringle]

Originally posted by: TheKub

Originally posted by: ixelion
and power on through mouse and keyboard input is a common feature on mobos these days.

Any one confirm this? I havn't built a PC since December and have NEVER heard of this.

It's an option on the nearly 5-year-old Biostar motherboard in one of my computers (and in all of the newer ones), so it's been around at least that long...

 

[boomerang]

Did you remove the front of the case? Any chance the power button is stuck?

 

[WT]

I just fixed a PC I sold last month that had this same problem. For the life of me, I couldn't resolve it before sending it back to the customer, so she waited until the family was going on vacation, so I banged away on it last night and FIXED it ! I first tried a BIOS update, as it was an older PIII/933 chip with a Via 133 board (Abit VA6) and that didn't help. I had already tried turning off the automatic restart upon an error in case a driver (in your case, you did sway the hardware so that's a possibility).

I then viewed Device Mangler and set it to view hidden devices, and under Non-Plug and Play found the PC had a red exclamation by the APCI, so I had it search for an updated driver which cleared that condition. I cleared the CMOS after the flash and made sure everything was disabled for the 'Wake On' settings, such as LAN or mouse.kboard. What looks to have fixed it was going into the actual NIC properties and turning off any 'Wake On ..' events listed in there. It shut down for the first time that I've worked on it.

Good luck with this one .. there are dozens of reason why a PC will reboot when you want it to shut down, so it really is a matter of finding the correct solution for each given problem that crops up.

 

[jennifermapco]

Please check wake-up settings in bios disabled or not. If setting is correct then contact system administrator.