In the past week my PB got a bit erratic when I try to power it up: The small "sleep" lamp in the front goes one but it won't go as far as accessing the DVD-drive (checking wether there is a disc). This still before one could access the OF or bootmenu. Sometimes it did boot and it seemed it was somehow depending on how I was holding it. So I opened it and noticed that the mSata-module in the 2.5" bay had allmost slipped of the IDE-cable, reseated it and for a week or so it all seemed fine before the trouble started again. My next assumption is that the PB allways thinks it's lid is closed and made a small test with my iBook. Hit powerbutton, close lid -> iBook switched off and stayed of when lid was reopened. This result is somewhat differnent to the issue with the PB which seems to be stuck in sleep-mode. Next step would be replacing the latch, assuming the lid-sensor is part of it.