This is a new problem, started immediately after moving the computer gently a foot to the left... When computer goes to sleep it shuts down. Then when I press the power button I hear the mechanical click but it doesn't power back up. Then if I unplug and re-plug it'll start back up. Happens every time like this. I've, reseated the RAM chips, repaired permissions and reset SDC (SMC? whatever you call it when you hold the power button in for five seconds after unplugging). What should I try now? All help much appreciated!