My macbook pro 4,1 (early 2008 model) will not sleep after being left idle. The screen turns off at the designated time, but the drive remains spinning and any tap on the touchpad brings the computer alive -- this drains my battery substantially when I leave it idle without a power source. Sleep works normally from hitting the power button/closing the lid. It's just the idle, lid open time that it won't sleep. Things I have tried: Altering the energy settings to every degree PRAM reset SMC reset hard drive permission repair (success) Console is not showing anything going on during idle time Here is my terminal log for the command "pmset -g assertions," Assertion status system-wide: ChargeInhibit 0 NoDisplaySleepAssertion 0 CPUBoundAssertion 0 EnableIdleSleep 1 NoIdleSleepAssertion 0 DisableInflow 0 DisableLowPowerBatteryWarnings 0 ExternalMedia 0 No Assertions. Here is my terminal log for the command "pmset -g," Active Profiles: Battery Power -1* AC Power -1 Currently in use: hibernatemode 3 halfdim 1 lidwake 1 acwake 0 sleep 10 disksleep 10 sms 1 hibernatefile /var/vm/sleepimage ttyskeepawake 1 displaysleep 10 Other things to note: I made a guest account and left the computer idle and had the same issue. However, I booted into safe mode and the hard drive sleeps properly. I'm not sure how to diagnose why safe mode would fix the problem. If you can shed any light on this topic, please do. Anything is appreciated, it's driving me nuts! Thank you.