MacBook will not display on external monitor in clamshell mode

System information:
13 in. MacBook (2.4Ghz Intel 2-Core)
10.6.7
External Display connected with Apple DisplayPort VGA adapter
Apple Wireless Keyboard
Generic wireless mouse that connects to a USB stick plugged into the MacBook
This is dirving me nuts because it was working perfectly until about 2 weeks ago. I was following the pocess outlined here. http://support.apple.com/kb/HT3131
Here is what happens now:
MacBook display and external monitor are in mirroring mode. All devices are powered on and plugged in.
Close MacBook lid. MacBook goes to sleep. Blinking LED.
Hit spacebar on the Apple Bluetooth keyboard. The LED changes to steady on. However, the external display never shows the desktop. I've tried Command-F1... nothing.
If I open the lid again... the MacBook goes back to sleep.
I then have to pull out the DisplayPort VGA adapter to wake the MacBook up again.

You could try resetting the SMC and see if that helps.

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Morning aeck692,
Thanks for using Apple Support Communities.
For troubleshooting on this, take a look at this article:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
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Hello Hatchlovesbees,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that your HP Pavilon Media Center PC m8100n will boot up, but is neither displaying an image or any errors on the screen. I would be happy to assist you, but first I would encourage you to post which operating system you are using. And whether your operating system is 32-bit or 64-bit as with this we can provide you with accurate information.
Which Windows operating system am I running?
Is the Windows Version on My Computer 32-bit or 64-bit?
Please re-post with the requested information and I would be happy to provide you with assistance. Thank you for posting on the HP Forums. Have a great day!
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MacBook will not display on external monitor in clamshell mode

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