PC randomly boots up in the middle of the night.

[Forsete]

I've noticed that this small and cheap pc that I use as server, randomly boots up, mostly during the night. After a few seconds, usually about 5, it shuts down again like nothing happened.

The only thing that I can think of, is that box I checked when Linux asked If important updates are to be installed automatically. But then again, I don't think updates could be installed in that small amount of time. Whenever I boot it up, it takes even longer to get Linux up and running..

Does anyone have any idea what this could be?

 

[SoggyTissue]

wake on lan enabled? possible short causing the wake effect?

try pulling the plug on the network/internet, if it dont wake during the night, you know its a wake signal