Mac mini not displaying on HDMI monitor

Well, I have a Mid-2011 mac mini, and I have this monitor problem. While my thunderbolt moniter always works, (with a VGA adapter) my HDMI port hardly ever works. I have dual monitors, one HDMI and one VGA. They are both the same exact monitor (Dell Monitors) which both have VGA and HDMI ports. One is using the HDMI and one is using VGA. The HDMI one is all ste up, and has worked in the past, but it is currently not working at all right now. The VGA one always works, but the HDMI one switches on and off and either works at some point, then after a computer resart, it refuses to work. I belive its my computer that is refusing ti regognize it or something. Any hints help!

I do not have a solution for you.....but as to the suggested resets.....so you will know the intent....
support.apple.com/kb/HT1379
support.apple.com/kb/HT3964

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