Problem with Mac HDMI - Thunderbolt display to Sony (not a cable problem) I have a 13-inch Macbook Pro with Mountain Lion installed. I bought an HDMI - Thunderbolt cable months ago in order to watch movies, TV shows and whatnot on my TV (Sony Bravia). The cable had been working out great for me since I bought it; the audio and video quality was exceptional and it gave me an almost perfect HD experience whenever I watched shows on my TV via my Macbook.

However, the last couple days I have been running into some major problems with this display connection and has left me quite confused and frustrated. Basically, the Macbook is no longer able to detect the display! I connect the TV to the laptop and ensure that the connection settings are proper (ie, I have connected to HDMI 1 and proeprly set the TV's input to HDMI 1 as well). The Macbook's screen will flash once and the TV will go from the blue "No Signal" screen to a blank black screen. Previously, this is when the extended screen from the Macbook would appear on the TV and I can drag windows onto the screen. Unfortunately, none of these occur (can neither see the computer screen on my TVnor be able to drag windows onto the extended screen).

I have tried a plethora of troubleshooting steps; I have restarted the computer many times, turned the TV off and on, tried connecting the cable at different times (when just TV is off, when just Macbook is off, etc). I have also read up endless forum posts about this issue, but have yet to found a worthy solution (sorry, to many forum posts to put on this Question. It is a simple Google search away...)

Before I beg the world for help, I would like to share one piece of pertinent information that may be helpful. I have isolated this to a Macbook problem, not a problem with the cable or TV. I connected my other laptop (a Dell XPS with Windows 7 installed) to the computer with the same HDMI - Thunderbolt cable and I was able to successfully watch a Simspons episode on the TV with top-quality audio and video.

All help is much appreciated, especially if it saves me a trip to the local Apple Store. Thank you in advance.
I solved this one!
make sure your digital tv isn't on