Hey I have a Mid-2009 13.3 inch Macbook Pro. I added a Western Digital Scorpio Black 7200rpm 500gb hdd as well as 8GB of ram. The problem I have been having is that my macbook won't go to sleep by itself if I let it idle. The only things I have running are Dropbox, SMCFancontrol, and Blackberry Wifi Music Sync. I turned off the screensaver too. I tried resetting the PRAM and the SMC, but it didn't work. My sleepimage is 8.0gb. I'm wondering if the inability to go to sleep by itself could be due to the sleepimage? The macbook will go to sleep if I close the lid though, just not if I let it idle like in the energy saver settings. Thanks.