Mac Mini on Toshiba Regza Z3030 42" via DVI- HDMI

Hello,
I'm trying to connect a Core2Duo Mac Mini (running 10.4.11) to a 42" Toshiba Regza Z3030 Full-HD TV via a DVI-HDMI cable. The TV does 1920x1080 (both i and p), but when I select 1920x1080 (interlaced) from the display resolution menu in System Preferences, I get a black frame around the image that is twice as large on the right side of the picture than it is on the left or top/bottom sides (so even if I enable overscan, the picture is not acceptable, as it's missing a strip of the desktop on the left, top and bottom sides then).
I'm running the TV on "Exact Scan" mode, which (according to the manual), should display a 1080 signal exactly the way it is received from the source, no stretching or scaling at all.
Incidentally, the grey screen with the Apple logo and the spinning progress indicator fills the screen completely in 1080i, but as soon as the login panel comes up, the picture gets the black bars, so I think it's a MacOS X issue. Can I somehow tell the Mac not to switch the display settings after the booting process is finished, as the image during the boot process is perfect?
Any hints on what I could try?
Thanks in advance,
Georg

Ok, I decided to take some more time and googled for how SwitchResX actually works and what all the settings in the "custom resolution" view mean. I stumbled across a very useful tutorial in this forum thread: http://www.avsforum.com/avs-vb/showthread.php?t=751713
Following these instructions (basically, I just had to play with the "front porch" and "back porch" parameters until the image was perfectly centered), I ended up with a custom resolution in which the image is centered, but still has black bars around it.
Next, I simply turned on "Overscan" in the Display preferences while setting the TV's HDMI port input to "Exact Scan", meaning it will display the image exactly the way it comes over the HDMI port, without extra scaling.
With this combination, I now ended up with a picture that fills the whole screen and has (according to a test image) a "1 to 1" pixel mapping. Also, for some reason, this new resolution that I made myself rather than taking the values off the internet "sticks" between sleep and wake cycles as well!
For some reason, though, the TV only reported that it supports 50Hz vertical sync in 1080p when I used the "Export DDC" function in SwitchResX, even though according to the manual it also does 60Hz (and the default 1920x1080, 60Hz resolution from the Display preferences works as well). Therefore, I was only able to make my custom resolution for 50Hz, as I need the values from the DDC export as a starting point.
I only want to use this Mac Mini/TV combination as a media center for movies and music streaming via iTunes, so I guess it won't make any difference wether I'm running it at 50Hz or 60Hz?
Anyways, I hope this thread might help other people with the same TV who are having similar problems with their Mac Minis.

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Mac Mini on Toshiba Regza Z3030 42" via DVI- HDMI

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