Once in a blue moon my machine boots up after I put the little dust cover on it. This piece of plastic simply covers the top fans in the box, in aid of less dust inside. I wait at least an hour after shutting down before I put this dust cover on. I've always let the bahstage complete booting (after this surprise boot) before I shut it down again via software. The last time it happened I simply "leaned" on the power button to achieve shutdown. Not smart. Next boot I was presented with messages that at first let me think it was all over for this box or its software. But a bit later I saw the screen that essentially said "Press F10 to continue booting." This worked and I had a normal boot after complying. Whew! So I will always let the booger boot and I'll shut it down normally in the future, after this automatic surprise startup happens. I don't have "sleep" or anything else that's similar enabled. But I do have "please reboot after a power failure on the mains" enabled. Any clue? Thank you!