My early 08 MBP has seemed to have lost the ability to do the above 3 functions. Pressing the power button does not bring up the shut down/restart/sleep menu and going through the menu bar and clicking "shut down" does nothing either. Pressing cmd + shift + Q does nothing when it used to bring up the log out option. It's only been like this the past few days, I noticed when I was prompted to reboot for the SMC update but OSX did nothing after I clicked the reboot button. The only way to shut down or reboot is to perform a forced shut down. I've repaired disk permissions, repaired the disk, reset the SMC and the PRAM but nothing has worked. Help please? Thanks.