My first-gen MacBook is running 10.6.8. For a few weeks now it's been going to sleep only sometimes, when I close the lid. I've been poking around all over the web and through a lot of forums. Here's what I've tried: checking printer queue and uninstalling printer there are no Bluetooth devices enabled unplugging, removing battery and holding down power button for five seconds resetting PRAM resetting SMC repairing permissions setting to Sleep from Apple menu doesn't work logging in as another user gives the same problem booting in Safe Mode doesn't work resetting Energy Saver settings to default opening Terminal and running pmset -g assertions (this gave me all 0s except for EnableIdleSleep 1, but didn't give any further information) installing PleaseSleep, setting Energy Saver to sleep in 1 minute--it still won't sleep. UPDATE1 I typed syslog |grep -i "Wake reason" into Terminal and got a whole buttload of responses. It seems there is a USB error happening that causes it to wake. Example: Wake reason=USB4 USB7 What does this mean and how do I deal with it? UPDATE2 I remembered that this MacBook was set up to synch with my wife's iPad2, so I disabled that feature on the iPad2 and also on the MacBook. Didn't help. Interestingly, it did go to sleep when I let it time out naturally according to Power Saver setting before installing PleaseSleep. So what could be happening here?