Mac Mini does not display HDMI 1080i in full screen on TVs

I have a 1.66 GHz Intel Core Duo Mac Mini that I am having problems getting video to display 1920 x 1080 @60hz in full screen on my Sony XBR 1080p HDTV. The Mac is connected to the TV via a DVI to HDMI cable. The Mac recognizes the display as a "Sony TV"
When the Mac first starts up the entire TV screen is filled with the grey Apple startup screen, but when the Mac fully boots and gets to the desktop, the screen has shrunk so that it is slightly off the screen on the left, and has about 80% of the screen filled horizontally and about 90% vertically. I have tried all combinations of the overscan selection on the Mac and on the TV, but they make the image about 120% of the size of the screen so the top, bottom and sides are cut off.
I have tried 2 different 1080p HDTVs with the Mac Mini and get the same results for both TVs.
Now here is the thing that makes me believe that there is something funky with the Mac Mini. If I take my 2.16 GHz Macbook Pro 15" Intel Core 2 Duo and plug its DVI display port into the Same DVI to HDMI cable that is connected to the same Sony TV, it displays full screen with no problems.
What can I do to make my Mac Mini display properly?

Thanks for the ideas.
I did as you suggested, but the only 1920x1080 selection shown was one for "NTSC" which I would think is interlaced. This was after a reboot. All of available resolutions are labeled with "NTSC". When I look at the screen resolutions on my MacBook Pro when it is connected to the TV, they are labeled as "Interlaced". On both computers there are no progressive scan selections.
As an interesting note, regardless of what display resolution I select, the display area on the TV screen remains the same which is about 80% of the screen offset to the left. When "overscan" is selected, this mode enlarges to image to about 120% of the screen and cuts off the menu bar etc. However the MacBook fills about 98% of the screen in "normal" mode.
If there was a less aggressive Overscan mode or more aggressive normal mode, that would fix the issue.
Any other ideas on how to adjust this?

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