I can no longer project from my laptop to the tv after upgrading to windows 8.1 64bit. I have tried updating the drivers numerous times and the HDMI cable is fine works with another computer so nothing is wrong with cable or tv. Tried the usual display settings it only finds one screen and project to second screen options are correctly applied, tried to add a device cannot find second display. It kind of knows the Sony TV is there as it shows in the audio output but it won't discover the display.
Finally once I give up and post the question I find an easy solution. If anyone has the same annoyance it's all in the order of doing these things. Make sure you have the project to second screen set to duplicate then just unplug the HDMI cable from the computer and replug it in. Make sure the tv and computer are on at the time I actually had the Project to second screen duplicate settings on the computer screen viewable onscreen when I disconnected and reconnected the cable again. With any luck that simple unplug and replugging in the cable when the project to second screen options are up will give you a glorious display. Sometimes its easy.