Hi, new guy here, couldn't find the solution by searching the forum. I got a Pavilion G4-1318dx with Windows 7, and until today, I've connected it to my Vizio HDTV through the laptop's HDMI port with no problems whatsoever. Since this morning, however, this has somehow stopped working.
When I plug the HDMI cable into the laptop's port, the screen for the laptop goes black (as it usually does cause I have the settings at "projector only" to save battery/energy), the laptop makes the "device plugged in" notification sound, but then nothing shows up on the TV, saying "No Signal". It wasn't the HDMI cable, as I tried a different cable to no avail, and the same problem happened on a separate TV. There are no error messages, and I didn't change/install any programs between when it last worked and now. I also tried doing a System Restore, which did nothing for the problem. And messing with the "screen resolution" settings in the Control Panel hasn't helped at all. I managed at one point to get the laptop screen on with the cable in, but even switching to "duplicate" in projector settings did nothing. The laptop simply isn't sending the signal out through the cable.
Your help is appreciated. It should also be noted that my warranty is expired and I haven't bought extended coverage (yet).