IMac 2011 Mini Displayport not displaying 1080p

Hi all,
So my 2011 21.5' iMac is only allowing me to display at 1080i with my mini displayport to HDMI adapter. When I go up to 1080p the TV has no signal.
To check that the TV was able to show 1080p, I connected it to my 2009 macbook pro and sure enough it can display in 1080p. So now I am
sure it is not the TV, but the computer. I'm using a monoprice adapter bought in 2009 before thunderbolt was available. Could my problem be solved
by buying an updated adapter?
This is what I'm looking at:
http://www.monoprice.com/products/product.asp?c_id=104&cp_id=10428&cs_id=1042802 &p_id=5311&seq=1&format=2#description
Thanks.

Hi Eric,
Could my problem be solvedby buying an updated adapter?
I'd certainly give it a try.

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