Driving external display

I've been using my Macbook Pro with the external display (apple 23' cinema display). As recommended, I'd start the macbook pro, then close the cover, connect the display and press a button on an external keyboard. This will wake the computer up, and the display will start working.
However, as soon as I installed 10.5.2 (or possibly Leopard Graphics Update), this stopped working. The display lights up for a second and then goes dark and the computer goes back to sleep. The only way to use it is by keeping the laptop lid open and then connecting the external display. Then the external monitor works just fine, but the computer's lid is open and its display is also on.
Does anyone experience anything similar?

There seem to be a lot of problems with using an external display with an MBP. I'm a recent switcher, and have been delighted with the system and OSX, but this seems to be a weak point.
My system came with 10.4, and it had similar problems. I wanted to use the external display with the lid closed, and eventually found a KB article which describes the specific sequence needed to enable that to work:
1. Boot system with display disconnected.
2. Connect external display, external keyboard & mouse, etc. Let them enumerate.
3. Close the lid. The system will go to sleep at this point.
4. After the system is sleeping, wake it up using the external keyboard or mouse.
At this point, the external display should become active.
Then I upgraded to 10.5. Now I have several problems.
1. Sometimes after using the external display, when the system wakes up without the external display connected, the laptop display is blank. It appears that the system thinks the external display is still connected, and isn't enabling the laptop display, even though the lid is open. I'm guessing that selecting 'detect displays' would work, but since the display isn't active, I don't know how I would select that Force reboot using the power button is the only recourse I can think of, but I really hate doing that. Any other ideas?
2. This one happens more often, and is quite annoying. If I have the external display connected when I boot up or wake up the system, about half the time the external display takes on the same lower resolution as the laptop display. The higher resolution mode isn't even listed in the display properties menu, nor does selecting "Detect displays" have any effect. My only recourse is to disconnect the display, then reboot, and reconnect the display after rebooting. This always fixes the problem, but of course is a big inconvenience. Any ideas?

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    Message was edited by: isonoise
    Message was edited by: isonoise

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    Message was edited by: Robert Derelanko

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