here's the thing; it's really freaking me out. lately, I've had occurrences (more than 5 times in the last 2 weeks), where the OS just freezes, everything except the mouse. nothing would work: the Force Quit option, the power button (single click), nothing; I can still move the mouse, but not click with it. the only way out is holding the power button for like 5 seconds to shut down the MacBook by force. PS. I'm on a MacBook (4,1), 2.4Ghz, 2GB RAM, 160GB HD. Bought it back in September 2008. PPS. It's still in awesome conditions, and never dropped it; I take good care of it. Thanks in advance.