Q: "No Signal" on my Samsung TV when trying to connect my MacBook Pro
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Aug 29, 2013 8:47 AMby Allen A,Hello TT31,
A quick fix you might attempt would be making visible, then clicking, the 'Detect Displays' button in the Displays pane of System Preferences. It can be made visible by holding the Option key once you've brought up the Displays pane (it will appear at the bottom right near the question mark).
OS X Mountain Lion: About the Display pane of System Preferences
http://support.apple.com/kb/HT5369
If that doesn't get things working, I'd recommend taking a look through the following article, as it provides a whole host of useful troubleshooting steps for just such a situation.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen
