Well I'm happy to hear your system works.
As I said it boots and I can get to the bios etc before Win 8 starts so a signal is present. However once Win 8.1 starts it seemingly switchs off the screen signal and consequently my HDTV screen goes blank.
I use a Sharp HDTV for my HTPC. I connect it to my PC via HDMI. Under Win 7 this works fine.
I switched to Win 8.1 and with the exact same set up Win 8 Blanks the HDTV after booting.
I tried connecting a PC monitor as a second screen and Win 8 blanks that as well at the same time as the...