I'm also an Avermedia user previously purchased their C127 Game Broadcaster HD and recently the C985 Live Gamer HD. On my platform both of the cards performed very well, had no problem with display issues so far.
I'm wondering about few details regarding your setup.
You said that:
1. don't get any signal from the capture card
>>does that mean that you don't get windows screen on your monitor or windows screen can be seen but there is no video in RECentral
2. I hooked it up to a TV and removing the HDMI/DVI conveter cable and using the HDMI
>>does it mean GPU out-----HDMI cable-----Capture IN
or GPU out-----HDMI cable----Capture IN
3. What if you try the following setup: GPU out---HDMI cable---HDMI/DVI Cable "Avermedia provided" -----My own DVI cable----- Monitor, what is the result you get this way?