External screen doesn't go into standby when putting MacBook Pro into sleep

I'm using a new MacBook Pro with an external monitor (DELL P2411H) through a Mini Displayport to DVI adapter.
When putting the Macbook into sleepmode, the external screen goes into standby but immediately wakes up, then goes back into standby and wakes up ... this cycle doesn't stop. The only option is to manually push the powerbutton on the display.
I'm having this issue too when using a MacBook Pro 13", so it's not a single issue.

I got similar Problem, my external monitor will go to standby mode and then switch on immediately, and the go to sleep , and the monitor will show no signal detect

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When you first put the computer to sleep, the light should be on. You should not physically move the computer until the on light begins to pulsate. Once the light begins to pulsate, your hard drive has stopped spinning. If you move the computer when the light is on, you could lose data, because the drive is still spinning even thought the computer is asleep.
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Maybe something in the process of the playing makes the the screen turn on automatically. I usually?use playlists, maybe the screen turns on when the?play stop?
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
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http://osxdaily.com/2011/11/15/repair-user-permissions-in-mac-os-x-lion/
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Alex Rosenfeld wrote:
I have a MacBook Pro which I keeped docked into/connected to my Apple LED Cinema Display when I'm not on the road or at meetings outside of my office. This allows me to work with my MacBook Pro closed and with a keyboard and mouse at hand, almost as if I'm using a desktop.
My father's asked me to look into purchasing an iMac for his home, which I frequently visit. Would it be possible for me to dock my MacBook Pro into the iMac display similarly to how I can dock my MacBook Pro into my Apple LED Cinema Display? (And, if so, are there any additional accessories I need to do this?)
For example, can I close my notebook? Can I use the iMac mouse and keyboard? Can I play music on the iMac speakers? Can I use the iSight camera? I realize the iMac needs to be turned on when being connected to, which implies that the iMac operating system and programs would be running in the background, but can I basically keep the iMac operating system and programs "hidden" so that it feels like I'm purely using my MacBook Pro?
Thanks in advance,
Alex
See if sharing your screen allows all the functions you want:
http://docs.info.apple.com/article.html?path=Mac/10.6/en/11848.html
Mac Pro Quad Core (Early 2009) 2.93Ghz w/Mac OS X (10.6.4) MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.4)
LED Cinema Display G4 PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

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Press the Power button for about 10 seconds to shutdown the computer. Wait a couple of minutes then restart. If it restarts OK, then immediately repair the hard drive:
Repair the Hard Drive and Permissions - Mavericks, Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
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External screen doesn't go into standby when putting MacBook Pro into sleep

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