Hi guys, I've got a MacBook Pro 4.1. Problem is that for a few weeks now, Activity Monitor shows 50% User CPU usage, even though there aren't any apps running! And non of the processes use this much! They use 1-2% at most! I force quite background processes but still it shows User % USER at 50-60%! Which sucks, as it drains the battery, the computer used to be quiet, now the fans can't stop at all! Pls, help! Cheers!