I just built a relatively cheap Ubuntu box for use as a home server. I had a monster headache getting my Win 8 machine to talk to it via samba, but this is beside the point.
I've now been attempting to transfer large amounts of media across the network to store on my home server and it keeps shutting itself off. I have set the "when to suspend" option in the power settings to "never" and it's still doing it. It doesn't even seem to offer any warning. It's behind me right now as I type this post and I'll just hear that "power down" sound (all the fans spinning down, etc.) and it's off. When I turn it back on, it goes straight from POST to the login screen, so I'm guessing this is some manner of suspend/hibernate behavior. And... it just did it again. This is getting really frustrating.
Anybody know of anything else I can check? I'm praying it isn't a hardware failure. I just bought the stuff.