MacBook Pro won't stay awake with external display AND power connected

I've been using my MacBook Pro with an external 23" Apple display for several months, always with the lid closed and with no problems. Suddenly, I can no longer keep the MacBook awake when its lid is closed. *The AC power IS connected.* I plug in the display, close the lid, wake the system with my external keyboard, but then it will quickly go to sleep again after a few seconds. No matter what I've tried I get the same behavior.
Perhaps coincidence, perhaps not, I installed the Leopard graphics update a few weeks ago. Could this be a cause?

Apple did actually acknowledge this as a known issue with people running 10.5.2 with the graphics update, and are investigating it. There's some further discussion at this thread:
http://discussions.apple.com/thread.jspa?threadID=1394449&tstart=0
Anyway, what worked for me was powering down, connecting my external display, keyboard, etc., powering up, and immediately closing the lid. It seems to behave better now, though I haven't rebooted since, although I have switched back and forth between running with the external display, and running without it, without any problems.

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MacBook Pro won't stay asleep with external monitor attached. When sleep is selected from the Apple menu the computer will go to sleep only to continually wake up...go back to sleep...wake up...etc. every few seconds.

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Mine does that too. The worst thing is when it goes to sleep, then wakes up and keeps running while the lid is closed and it is wrapped up in a case. I am afraid when the hot weather comes it is going to burn up. I am hoping Apple fixes it in the software or they may have a melted MBP to replace.
Then when I open the lid it is crashed running at fill tilt, pumping out heat to beat the band. I am forced to hold the button down and reboot.
I wiped my hard disk and reinstalled my OS, but it didn't help. I reversed my OS to 10.5.0 and it solved the DVI problem but still won't sleep. This post will probably be deleted by Apple, they did it a few days ago. I just don't know what to do, and I consider myself a real Apple expert. Just hoping you realize you are not the only one.

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Hi again ggt15,
You can find some more information about the Recovery Partition of your hard drive here:
OS X: About OS X Recovery
http://support.apple.com/kb/HT4718
It sounds like you might be trying to reinstall your copy of the operating system. If that's the case, you may also find some helpful information here:
OS X Lion: Reinstall Mac OS X
http://support.apple.com/kb/PH3878
Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://expresslane.apple.com/GetproductgroupList.action.
Cheers,
Braden

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Hi S,
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Your MBP will deal with up to 1920 x 1200 which is pretty good on an external (say 23" monitor)
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Hi Bizzlewood,
Welcome to the Apple Support Communities!
I know it can be both frustrating and concerning when your computer doesn’t seem to wake from sleep. There may be a few different troubleshooting steps I would suggest in this situation. Please refer to the attached article for troubleshooting information.
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If you are using a Mac notebook:
Make sure the computer's battery is charged. Try connecting the power adapter to the computer, then press the power button for one second to see if the computer powers on.
Make sure the AC power cord is connected securely to the power outlet, and that the outlet it is working correctly. Confirm the power adapter or cable is attached firmly.
If your computer is plugged into a power strip, make sure the power strip is not turned off. Check to make sure other items connected to the power strip are receiving power.
Confirm the right power adapter is connected on Mac notebook computers. If a lower wattage power adapter is used than the one that came with your Mac, it may not provide enough power to charge the battery while the computer is powered on. Make sure there is no debris in the MagSafe port that might prevent charging. When your MagSafe cable is connected properly, you should see a green or orange light on the connector.
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MacBook Pro won't stay awake with external display AND power connected

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