Please help! not showing proper resolutions!!
 

hey there, i'm running off a mid 2010 mac mini 2.4 core2duo running 10.7.4 and i can't get my hdmi adapter to pick up proper resolutions, was considering a reinstall but it's not showing true 1080p like it is via my hdmi port, highest it goes is 1360 x 726 and its only showing like 3 resolutions under that. i really like the fact that i have 3 monitors running off my mac mini and don't want to return this in hope a different model may work. any suggestions would be awesome, thanks

http://i.imgur.com/jPQYW.png