Err, sorry if there are existing threads about this one. I can't seem to use the search function, it stops loading. I own a Penryn Macbook Pro bought last April 2008. I usually put the laptop to sleep. When I opened the lid, I didn't see anything from the screen, but it's still on... so I pressed the power button to turn it off (force shut down) When I turned it on, I just hear the super drive then it turns off... while it turns off I hear a click from the left side. Before this happened, the laptop would just turn off (with the same click sound) even there's still 50% left in the battery. It happened about thrice. It doesn't happen when I use it with the power adapter plugged in. Could this be a logic board problem? Tried resetting the SMC thing, I couldn't reset the PRAM because it won't even go past the start-up chime. I guess I should bring this to the nearest service provider...? Good thing I got AppleCare.