Late 2010 MBP WIll No Longer Display 1080p for External Monitor

I currently use my 15" 2010 MacBook Pro with an external monitor via an HDMI cable using the Moshi HDMI miniport adapter. Recently when I connect the monitor (I've also tested on a different HDTV and have had the same issue) it recognizes a signal but all it displays is black. Only when I change the signal to 1080i do I get a picture (a poor quality picture). Is there any fix for this? At this point I'm thinking that it's either the adapter or the MBP's hardware that is messed up. I have been using this HDMI adapter without issue since the summer.
Any help would be appreciated.

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Late 2010 MBP WIll No Longer Display 1080p for External Monitor

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