[ubuntu] Computer restarts on shutdown

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http://ubuntuforums.org – Hi, I have a problem with my computer occasionally restarting on shutdown. Sometimes when i shutdown it reboots. At the login screen, i can shutdown and it seems to always shut down properly from there. I have read elsewhere that this might be a power setting in the BIOS, but i think not as i) it doesn't happen in windows (which i dual boot) and ii) it only happens some of the time and never if i shutdown straight from the login screen. Its not a world-ending problem, but its a bit of a hassle if i am in a rush to go somewhere and want to shut my machine down and it decides to restart. T (Hardware)