HDMI connected to work flatscreen not displaying, but detected

Hi all.
I'm having an HDMI output problem on a MacBook pro retina, just got it a couple days ago.
When I connect to the flatscreen in the conference room (Toshiba) via HDMI, the mac screen does it's resolution-switching blue flicker, and I get, in the displays prefs, confirmation of the fact that it sees the Toshiba. However, no image on the Toshiba.
I consider myself a pretty adept wrangler of these things and I'm stumped. Things I've tried:
* Running in forced dedicated card mode
* Running in forced integrated card mode
* Scaling to all the available resolutions (believe me I tried every combo)
* Trying all the refresh rates
* Plugging in another Macbook (one with an mini dongle to HDMI) and it works fine, so input is correct, etc.
* Trying mirrored
* Trying non-mirrored
* Rebooting the TV
* Rebooting the computer
* Made sure all the update are applied (including the displays firmware one)
* Blowing on the cables (I'm superstitious)
I'm considering animal sacrifice.
Any thoughts? It seems like getting rid of a dongle should simplify, not complicate things!
jm

Sorry ilesal, I was referring to the OP. The solution that worked for me was enabling 'dynamic switching' in gfxCardStatus. However, that was the first option the OP tried, so I'm sorry I cannot help
On the bright side, I have had nothing but success with Apple Customer Support. My two previous rMBPs were faulty (I'm on my third now - finally got one without software or hardware problems) and I had no problems exchanging them for brand new units, even when outside the 14-day grace period. If you have the possibility to go to an Apple Store in your area, and if you can stand to deal with the "Geniuses", I think it might be worth your trouble. Good luck!

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HDMI connected to work flatscreen not displaying, but detected

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