I just built a home theater PC and I cannot get the HDMI port to work without having a monitor hooked up to the DVI port. In fact, if I boot the HTPC without a monitor hooked to the DVI port, it will not boot at all. The HDMI port works perfectly fine if there is a monitor hooked up to the DVI but once I reboot without the DVI, it does not work. I've tried everything from looking at the motherboard bios to enable HDMI (nothing there) to using CCC to enable the HDMI (nothing there) to disabling the DVI and hopefully forcing the HDMI to turn on but nothing worked. The HTPC is brand new with no bloat and up to date with all Windows drivers. Here are my specs:
Asus H87 Pro MB
Radeon R9 270
Windows 7 Home Premium (clean install with up to date patches)
Latest Catalyst Control Center (as of 1/27/14)
Sandisk Extreme SSD 240GB
I connect the HTPC to my Denon AVR 3808CI receiver and then to my Samsung DLP TV. Regardless of whether the HDMI is plugged into the receiver or the TV, I still get no signal and the machine does not boot into Windows. Any help would be greatly appreciated.