My MacBook turns on by itself as soon as I attach the AC adaptor

Hi guys!
My black MacBook has developed a strange self consciousness...
Each time I attach the AC cord, and even with lid still closed (!!!), it turns on by itself, then a black screen with something like "non system disk, replace and hit a key" appears; if I turn it off and then reboot hitting "alt" key and choosing Mac HD (the only choice that is shown, as the CD is emty), then everything goes fine...
Very very strange... Any suggestion???
Thanks and Ciao!
Sergio

Hi Bmer,
tried to reset the SMC, the first time I connected the MacBook to the AC adapter this morning everything went fine; but then again tonight it happened... Tha Mac turns on by itself with lid closed as soon as I connect it to the AC adapter, I open it while it boots (no more black screen with "non system disk", just a normal login) and I also find the screen brightness to its full level, even if I usually keep it at its minimum...
I will try to investigate deeper and report any other hints...
Ciao for now and thanks again
Sergio

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