First of all, apology for my english, I'm not english native.
I'm experiencing a problem similar to the above mentioned, but with HDMI:
I have had a notebook (Windows 7, Geforce 9600M GT, screen resolution 1280x800) with HDMI and access to 2 LG tvs, a 32" one and a 22" one, and the notebook worked fine in both TVs, connecting via HDMI, with the same cable.
I recently changed my notebook (still windows 7, GeForce GT 540M, last driver installed), and tryed to use HDMI in both TVs. The 32" one works fine, still the same cable. The 22" one was having image issues due to bad resolution. I tryed to change the resolution and now I the notebook doesn't recognize the TV (TV says no signal).
I kept on trying to connect to the TV, and somehow the notebook recognized the TV once, but I still couldn't set its resolution, so I got black screen on TV, but without the "no signal" sign.
It's a really wierd bug, and I believe windows saved the wrong resolution I may have tried and is trying to force it into the TV, and since I can't set the resolution without the TV being recognized, I don't really know how to reset this saved data. Maybe it's stored in windows' registry?
EDIT: Forget to say that the previous notebook, with GeForce 9600M GT, was able to recognize the TV as LG TV, and the new one is recognizing as Generic non-PnP monitor.
If I figure a solution for this, I'll post the step by step for it.