MacBook Pro never sleeps automaticly.

Hi, my MacBook PRO 2,16 C2D never sleeps automaticly. Wenn i push die Powerbutton and klick sleep, or go to the apple menu and push sleep than it works. BUT not automaticly.
I kill this Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist Pref. but nothing change.
I had this Problme since many month. Few days ago i installed a new 10.5.7 and backup my old user via TimeMachine – the same problem as before.
Anybody has a good idea?
THX a lot

On many sleepless computers, it is due to a program or process running that keeps the computer awake. Here, it was discovered to be Firefox that holds up the auto-sleep (but not the manual sleep operations). You can try safe booting it to avoid opening other processes and see if the operating system itself is stuck by holding shift on boot (after hearing the startup tone). Then, if it works, you can add processes at startup (System Preferences/Users/Login Items) and see which delays auto sleep.

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