Clamshell Mode source resolution problem

I own a Macbook Pro with Mountain Lion, and I have used my laptop in clamshell mode once. After i changed the resolution to see which would work better with my Philips tv, I have never been able to use CS Mode again. I am unsure if it is a computer issue or the tv.
I'm able to mirror displays and everything works great, but once I close the laptop to use CS Mode the tv says "Change source resolution". I have tried every resolution available in the scaled tab, and none seem to work.
HELP please!

I was having the same problem. I figured out that when I closed the lid my macbook was changing the resolution for the external to something that the monitor couldn't handle. I used VNC to remote into my computer and change the display manually - after that all was well. The monitor displays fine in clamshell mode now.

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