Upgrade messed up display resolution

Good evening.
I've been running my mini through my Denon AVR for some time now. I've been running it through MDP to DVI to HDMI. Everything has been working fine. I've had the resolution set up to 1080i (as I have an older Panasonic that is 1080i output). I upgraded tonight to 10.5.7. After the upgrade the resolution changed to 720x480. I'm unable to change the resolution back... it's not even showing as an option. I'm not a happy camper at this minute. How can I get things to be able to be changed to so I can choose 1080i. I really need to get this working again. Plex looks like CRAP!!!
Please help.

Probably a good time to have a look at http://www.macfixit.com
and in particular:
http://www.macfixit.com/article.php?story=20090514132546680

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