Well 10.5.6 has been so much fun and full of surprises - like a box of chocolates Gump would say. For some reason, the sleep function settings won't reset. I had my iMac set to sleep the HD after about an hour. I changed the setting to never, but it still wants to sleep. Never had any trouble like this before the update. My install is almost virgin as I had to reinstall because of the update. I don't have any add-ons running or anything like that. Any thoughts? Can I delete the .plist file for these settings to start over?