My OS closes down after 5 seconds of inactivity (with the alert pop-up) Since yesterday, when i'm running my computer, it shutDowns after 5 seconds of running. In order to make it work, i need to press continuously the escape key so the popUp alert  who close the computer can dismiss. 

When the os is launched, if i let the computer sit without any input, the alert panel appears, and if i don't do anything, my computer shuts down after the alert panel has been shown for 2 seconds. So this is very annoying.



Strangest thing is, that it appeared the same way last year (between october and november), and it disappeared same way it appeared. I have tried to change calendar date and time, but it was unsuccessful.

My question is: What could cause this alert firing ? Can i get a way to catch the *$**%* process who send this? Of course i can re-install the OS, but that's out of the question.

I have googled it and it seems that nobody has encountered this. I'm on Lion 10.7.4 and running it on a macBookPro, but last year on snow leopard the same thing occurred. I don't think it's a virus since it should appear on lots of computers, but it seems to appear only on mine.
That window appears if you hit the power button, maybe your power button is faulty and thinks you are hitting it. This also would explain why this problem "auto-solved" itself without you doing anything (i.e. there was some dirt "triggering" the click, and it went away).