i have a nice little set up with an HDMI plug near my vista laptop that connects to my HD TV some 30 feet away. this way i don't have to tote my laptop to the TV when i want to stream internet video. i set it all up about a month ago and everything worked fine until yesterday. now when i plug in my HDMI cable to my laptop and switch my video source over to PC on my TV it doesn't detect any video. i know that the connection is solid because when i unplug the HDMI cable from my laptop the option to switch to the PC source on the TV goes away. i recently updated vista with some "required" update but don't know what it was or how to resolve this. any suggestions?