PC reboots instead of shutting down, no software problem. What could be the cause?

Posted by DaVinci on Super User See other posts from Super User or by DaVinci
Published on 2010-12-05T19:41:44Z Indexed on 2011/01/06 1:56 UTC
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PC

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shutdown

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power

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system-shutdown

Hi, first of all: I'm not sure if superuser is the right site for my question and google didn't help.
I have a pc here that prefers rebooting to shuting down. Everytime I try to shut the pc down it reboots, however it is possible to turn the pc off by pressing the power button. The problem is not windows-specific, the Ubuntu LiveCD does exactly the same that's why I said that it is no software problem. I checked wake on LAN, it is disabled and I also resetted the BIOS settings to factory default. That might not mean that it can't be a BIOS problem but I don't know what else to try here. I did not check any hardware yet but nothing exploded so far.
I don't know what could have caused this behaviour as it is not my PC.
The Mainboard is a ASUS P5Q-E P45.

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