Starting a couple of days ago, my 2009 iMac won't sleep. I created another user and when that user is logged in sleep is working fine. This leads me to suspect that some of the user settings are clobbered and I need to reset them to get things normal again without having to reload the system. Can someone tell me what files I need to trash to get my user settings wiped out? Alternatively I could always do a fresh reload of the system and then just recover my last Time Machine backup of my applications but NOT recover my settings. Please help! Thanks.