Problem connecting MacMini to new LG monitor

I can't get my new LG IPS235V monitor to work with my MacMini (mid-2011). Previously had the MacMini hooked up to a 30" Apple cinema display but am using it temporarily in a different location.
I set up the LG monitor and connected to the MacMini via HDMI cable. All I get is nothing, a black screen. Next tried hooking it up with a mini display port to HDMI adapter. Still nothing.
I have of course tried turning off the monitor and MacMini and restarting, and that didn't help.
LG support says it's a video card issue but since I can't see anything on the screen, I can't check the settings. They also kept saying how "difficult" Mac connections can be. Really?????
Is there anything else I can try? The only other computer I have available is a pretty ancient (2008) MacBook that doesn't have HDMI or mini-display ports so can't hook up the monitor to the MacBook unless I make a trip to get proper cables, and I'm a long way from the nearest computer store.....

Thanks for the suggestion. I used a mini display port to DVI-D adapter and cable and it worked like a charm. Guess it was the HDMI cable after all.

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