Whenever your PC wakes up, Windows keeps a log of why. To view, open a command line and run:
C:\> powercfg -lastwake Wake History Count - 1 Wake History  Wake Source Count - 1 Wake Source  Type: Wake Timer Owner: [PROCESS] \Device\HarddiskVolume3\Windows\System32\services.exe Owner Supplied Reason: Windows will execute '\Microsoft\Windows\Media Center\mcupdate_scheduled' scheduled task that requested waking the computer.
As you can see, my computer woke up because of a scheduled task. Open the Task Scheduler: And navigate to the task in question (\Microsoft\Windows\Media Center\mcupdate_scheduled, in my case). On the Conditions tab, uncheck wake:
Your issue above is exactly the same one I have.. however the task is never listed in the Task Scheduler... any idea what to do next? Would appreciate it :D
Please post the output of powercfg -lastwake; maybe there's another way other than Task Scheduler to wake the PC.
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