Go into powercfg.cpl and turn off the power saving for the monitor.
In short, tell it to leave the monitor on all of the time.
Then, when you leave it, open up Task Manager to the Processes tab - and click on the CPU column to sort by that
When you come back to it later on, you'll be able to see the processes that are running - and the most active (at that time) will be at the top of the list.
You can also check to see if powercfg.cpl has any changes that will allow the system to stay awake.
You can also check the Event Viewer to see any activity that's logged (go to it after the time that the system should have gone to sleep
Finally, you can log activity with Process Monitor (free from here: https://technet.microsoft.com/en-us/sysinternals/processmonitor.aspx ) and you will see everything that's happening (beware, the log file is huge and complex).
Edited by usasma, 16 December 2015 - 06:15 AM.
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