I noticed lately that my MBP would not sleep by itself. Also having issues with clamshell mode when connected to apple cinema display. When I open the lid, the laptop display would not come on and it fails to auto sleep. Monitor is off, sleep LED is solid. I tried the SMC reset thing. How do you know if that works? Apple says to follow the MBAir SMC reset command for the new MBP? Control+Alt+Shift+Power once? It does not beep or does not appear to do anything. Even after reinstalling the OS, my bluetooth keyboard and mouse are still paired (I thought SMC reset wipes those settings)? I also had this weird problem - I think I corrupted something on the disk. Disk utility could not delete the Mac OS partition to install the new OS. I just booted from a windows CD to delete all partitions. Then OSX installed fine. I must have corrupted the EFI partition or something which does not show up in disk utility. Anyway long post but please reply if you know solutions to this. I had to reinstall the OS to get it to sleep but am still confused about the SMC reset thing and the clamshell issue with the external display.