I am running my Windows 7 64-bit rig on a Samsung un32eh5000f LED TV and I am getting many occasions every day where the TV display the "no signal" blank screen. This mostly happens at random occasions.
The only solution I have is to unplug the HDMI cable and keep it out for a few minutes then plug it back in and / or unplugging the TV to "reset" and restarting the computer. This sometimes solves it but not always and usually taking many repetitions of this process. It usually detects the PC but displays in a non-native lower res with another unplug / replug of the HDMI usually puts in back in to native 1080p.
I have the latest video drivers.
I have the latest TV firmware.
I have tried different several different HDMI cables.
The other dedicated DVI computer monitor works flawlessly with this PC.
I use a DVI to HDMI converter adapter with my graphics hard which connects to my TV.
Q6600 @ 2.4ghz