Screen stays on all the time power savings set up

My imac's screen stays on all the time now once I upgraded snow leopard to 10.6.3 it has been doing this since I got the settings so that the screen turns off 3 minutes after inactivity but the screen never turns off now.
the only time the screen turns off is when front row is running.
Any ideas?

That is a bit quick to turn off the display from inactivity but that would be a personal choice. I let mine run for at least 10 minutes before the Screen Saver activates and then another ten minutes before turning off the display.
Try resetting the PRAM and the Systems Management Controller.
Reset the PRAM
• (Re)start the computer
• Immediately press & hold the CommandOption+PR keys
• Wait for two startup chimes
• Release the keys and allow the computer to boot.
Reset the SMC
• Shut down the computer.
• Detach the computer's power cord.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Reattach the computers power cable.
• Turn on the computer.
Dah•veed

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