I have a new build, fresh Windows 7 Pro install. All the latest drivers/BIOS. Running an i3-2120 chip, 8gb RAM. Mitsubishi WD-70635 DLP TV. If I boot up the PC with the TV switched to the HDMI connection I see the BIOS splash screen, then the TV goes blue until the Windows Desktop comes up. At this point everything is fine. I can get into Windows Media Center and watch live TV and recorded shows fine. The problem is if I change the TV over to another input and then try to switch back to the HDMI connection the PC is on, all I see if static or snow. It doesn't matter if I stay on the other input for 5 or 10 minutes or if I switch it immediatly back, the result is the same. Now if I get into the PC using VNC or Remote Desktop and change something on the graphics properties, all of a sudden I get a picture. I've also noticed if the computer display is powered down through power management and I switch to that HDMI connection on the TV, once I hit a key to take it out of display power down, the picture if fine as well. The intel software has the TV detected as Digital TV MEUSPTV10 and windows has it detected as Generic PNP Monitor.
I had an older computer running an e6400 chip and ATI HD5750 graphics card using the same HDMI cable and HDMI port and never had any problems with it.