MacBook Pro won't Sleep or Shut Down

My MacBook Pro won't go to sleep or shut down.
Sleep
The behaviour is the same whether I press the power button and choose 'Sleep' or whether I choose 'Sleep' from the Apple menu. The computer stays awake, but it loses the ability to respond to Keyboard Shortcuts, such as those used for Expose, and can get stuck in some Apps. If I close the lid the computer stays awake but the screen blacks out. Re-openning the lid does not re-illuminate the screen so I have to force shut down and re-boot.
*Shut Down*
The behaviour is erratic. Sometimes the computer simply ignores me (although it does close the 'Are you sure you want to Shut Down now?' window), and sometimes it goes to the blue screen with the progress circle and hangs.
*What I've tried already*
- Resetting the SMC
- Checked the Firmware versions are the latest

Sorry for the repost. New to this forum and I hadn't seen the answers to the last time I brought up this topic here:
http://discussions.apple.com/message.jspa?messageID=5050821

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1. copy and paste the following into TextEdit.
#!/bin/bash
idl=$"`ioreg -c IOHIDSystem | awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'`"
sleeptimer=$"`defaults read /Library/Preferences/SystemConfiguration/com.apple.PowerManagement "Custom Profile" | grep "System Sleep Timer" | awk '{print $5}' | sed -e 's/;//g'`"
st=`expr $sleeptimer \* 60 `
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MacBook Pro won't Sleep or Shut Down

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