HP Pavilion external monitor has stopped working with my Macbook Pro (Mid 2012) with OSX 10.8.3

HP Pavilion external monitor has stopped working with my Macbook Pro (Mid 2012) with OSX 10.8.3.  When I purchased the monitor a few weeks ago it worked perfectly when computer was in clamshell mode or with lid open. Now external display has stopped working.  When I turn on display it scans for signal but does not find it and then immediately goes into sleep mode.  I am using a DVI connection with the adapter for the mini display plug.  REALLY FRUSTRATING. Any help would be extremely appreciated. 

Hi lancekatigbak,
If you're having issues with the display out on your MacBook Pro, you may want to take a look at the troubleshooting steps in the following article:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Cheers,
- Brenden

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