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One night I'm working at my desk with my computer off. Suddenly my computer turns itself on. I've disabled mouse and keyboard inputs from waking it up. The only thing that should wake it from sleep is when I press the power button. Luckily there is a command that can tell you what woke your computer up. Open a command prompt and type "powercfg -lastwake". Here's what I saw:
Wake History Count - 1
Wake History 
Wake Source Count - 1
Wake Source 
Type: Wake Timer
Owner: [PROCESS] \Device\HarddiskVolume1\Windows\System32\services.exe
Owner Supplied Reason: Windows will execute 'NT TASK\Microsoft\Windows\Media Center\mcupdate_scheduled' scheduled task that requested waking the computer.
So apparently I have a scheduled task called mcupdate_scheduled that woke my computer up. Next step, go to the start screen and type "scheduled" and you'll see an application called Scheduled Tasks. The path to the task is listed in the message above: Microsoft -> Windows -> Media Center. Navigate to that in the tree on the left and look for the mcupdate_scheduled task. If you look at the task and go to the Conditions tab you'll see that the "Wake the computer to run this task" checkbox is checked.
Seriously? Who in their infinite wisdom decided that Media Center update was so important that my computer needed to be woken up for it? There's even a KB article for it: http://support.microsoft.com/kb/979878
lol.. 'seriously' thanks.
Dude spot on! Im sick and tired of waking up, and my room is 400 degrees. And my computer is on. I couldnt figure it out, i was about to beat my roommate up thinking he was doing some sneaky stuff until i ran. "powercfg -lastwake" i mean seriously, this is wrong on so many levels. It could trigger security alarms. I could of beaten my roommate up. Had me thinking i had a virus.... I mean come on microsoft where is your head on this one? Patch this nonsense!
Yip, Dustin and Mike
I've gotta agree with you here. Media Centre Update ... of all the things to wake up for.
My PC takes forever to boot from ULPS. And for the life of me, I couldn't work out why. It was driving me mental.
Thanks for the post and the link to the KB.
At least I didn't beat up my room mate.