Based on the problem description, it seems to be an issue with drivers.
You may try to download the latest video drivers for your graphics controller here:
Select the operating system version and try to install that driver when it finishes downloading, to verify that your system will accept it.
Make sure you test DVI cables or replace them.
I have enjoyed my HDPC for about a year. I was trying to adjust a 3rd party player application as for the first time as the aspect ration of a movie was off. Sundenly, I lost video to my flat screen. I have not been able to restore video to the flat screen from the PC (cable works fine). Re-booting results in win 8.1 logo, then screen blanks, and it appears the keyboard disconnects. I can remote into the PC and everything reports fine. I have uninstalled and deleted the intel graphics driver, downloaded and installed the most current software but the issue remains.
I use a USB from the PC to a seperate audio system and that works fine. Since everything I have looked at on the PC reports fine, it appears the signle completly drops as soon as windows starts graphics. I am using an HDMI cable for this, and since I do see the win logo, assume it is not the cable.
Any idea how to fix this? Appreciate help.
If the computer has worked for about a year, this could be a problem with HDMI port on the computer. You could try to update BIOS on the computer, this will interact with the graphics video BIOS.
Also, make sure to remove any Intel Graphics Driver from control panel and re install it: Intel® Download Center