I leave my iMac on pretty much all the time, I'll turn it off when I go away for a few days but that's about it. I reboot about once a week probably. Anyways, I've noticed a couple times in the morning it's been turned off, I know I didn't do this, so I'm wondering if there's some way to find out what caused the shutdown. This happens about once a month, at the most. Thanks, allison.