MBPro and monitor not staying asleep; new problem

Suddenly my new MBPro and its 24" monitor won't stay asleep!.
I ordinarily use the 24" monitor, leaving lid on my MBPro shut.
At night, I choose 'sleep" from the Apple menu and the mac and monitor sleep.
Suddenly, past couple of days, when I do this,
-monitor sleeps and then within seconds it pops awake
-If I raise the lid of my MBPro, the monitor of the laptop is black, does not come up until I use Software preferences to "detect display"
-only way I can keep both monitor and mac asleep is if I leave the lid of my MBPro up, then choose sleep, then the mac and monitor rest.
I suspect one of the recent sofware updates may be doing this.
Anyone else experiencing this?
Should I reset the PMU on the monitor?
(Does anyone know the precise steps todo this; I know about removing the battery and holding power key for 5 seconds but have been given different advice on removing power cord or not)

I've got a very the similar problem. Brand new iMac 24" that shipped with Leopard -- my first Mac after jumping ship fom the Windoze side.
I had iTunes updating it's album artwork and since it was taking a while, I went to bed. When I turned out my light, I realized the screen had not yet gone to sleep (a good 15 minutes after it should have). So I set up a Hot Corner to put the display to sleep. When I put the mouse there, the monitor would go to sleep, but wake up within 10 seconds. At first I thought it was just the mouse moving as I walked away, but it wasn't.
I ended up turning the computer off because the big beautiful screen was throwing too much light. Since, I rarely turn my computers off and they're usually doing SOMETHING, this is really annoying.
Admittedly, I haven't tried some othe the potential solutions above, but this has to be the same bug. Screen saver stays on, monitor comes out of sleep.
Any help would be.....well.....helpful.
Ian

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I've got a very the similar problem. Brand new iMac 24" that shipped with Leopard -- my first Mac after jumping ship fom the Windoze side.
I had iTunes updating it's album artwork and since it was taking a while, I went to bed. When I turned out my light, I realized the screen had not yet gone to sleep (a good 15 minutes after it should have). So I set up a Hot Corner to put the display to sleep. When I put the mouse there, the monitor would go to sleep, but wake up within 10 seconds. At first I thought it was just the mouse moving as I walked away, but it wasn't.
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Admittedly, I haven't tried some othe the potential solutions above, but this has to be the same bug. Screen saver stays on, monitor comes out of sleep.
Any help would be.....well.....helpful.
Ian

MBPro and monitor not staying asleep; new problem

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