Display will not shut down

I shut down the computer normally and it seems to go through its normal shut down process but then the display stays lit indefinitely. I can then force the display to shut off by holding down the power button. I have to do this each time I shut down the machine. Is there anything I can do to solve this problem permanently? What is wrong with the display and can I fix it?

Hi Heather, and a warm welcome to the forums!
I don't think it's the Display really.
Start with this...
Resetting the System Management Controller (SMC)
MacBook, MBP...
http://support.apple.com/kb/HT1411
Then, I think you should get Applejack...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
After installing, Reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
The 5 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
At least if it doesn't fix it, it'll eliminate a few questions.

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