Clamshell mode won't work with OSX Lion

I am running a 2010 13" Macbook Pro and a Dell ST2410 23" external display. I have been using an HDMI to mini displayport cable with this setup for over a year without a problem. Now my monitor goes dark when I try to setup the MBP in clamshell mode. I even tried to lower the resolution on the monitor to see if that would remedy it, and it won't display anything. This problem first started when I upgraded to 10.6.8, and now is giving me problems in 10.7. Help!

assuming that you have an external monitor (you said 23"), usb kbd & mouse. How do you start it up?
I always opened the lid, hit the power and quickly closed before the chime would sound. Do you boot OS X up, then close the lid? Or do you do it as I do?
My PB is on 10.6.8 and never had any issues, besides running a little hotter..

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Please click the Thumbs up icon below to thank me for responding.
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Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
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Clamshell mode won't work with OSX Lion

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