No picture when connecting Mac Mini GMA 950 to Panasonic TX-PF42G10 via HDM

Hi !
I have a Mac Mini Core Duo 1,66 GHz with GMA950 chipset (MacMini1,1 sold from february 2006 to september 2006) which I was using as a Plex mediacenter connected to an old CRT display via an s-video adapter.
I purchased a brand new Panasonic TX-PF42G10 plasma screen the other day, and for the life of me I can't get my Mini to feed anything to the HDMI inputs via a DVI/HDMI cable.
When I remotely connect to my Mini with ARD or VNC, I can see it successfully detects I have a "Panasonic-TV" and lets me choose 1920x1080 either in 24Hz, 50Hz or 60Hz. I tried all three : no picture.
Tried connecting this Mini via the VGA input: works fine.
I tried to install SwitchResX but I don't really know what to do with it. Tried to install Snow Leopard too, but it didn't help either.
YET I FOUND SOMETHING RATHER INTERESTING.
I have another more recent Mini (one of the new 2009 models), hooked up to a Samsung T240HD display via DVI. Since this display also has an HDMI input, I tried to connect the other, older Mini to it. And then... the Samsung display wouldn't let me pick the HDMI input from the source menu!
I thought "***???", and then I tried to connect the newer Mini to this HDMI input: works great! I then kept the HDMI end connected to the display, unplugged the DVI end from the newer Mini and plugged it back to the older Mini : BINGO, picture at last...... except the display kept showing a "No signal, check cable" message (even though it was displaying my Mini desktop!).
So I thought "OK, some handshaking problem I guess". I unplugged the HDMI connector from the Samsung display and replugged it immediately: like I thought, once more the display wouldn't let me pick the HDMI input!
So I guess this is the same problem I'm having with the Panasonic plasma: this older Mini is unable to tell the TV that it is connected to it, even though it can perfectly read the TV specs. I've had no time to check what happens if I connect the newer Mini to the Panasonic plasma, but I'd bet it will work just fine.
So basically, my question is: will I ever be able to use this old Mini of mine with this shiny new plasma screen, or will I have to purchase another 2009 Mini? Is there anything I can do with SwitchResX? If so, what should I try?
Thanks for taking the time to read, and thanks in advance to anyone who can help.

Sounds quite possibly like the Panasonic enforces HDCP over its HDMI inputs and the older GMA950 equipped mini is unable to oblige.
That's what I thought too, as the newer Mini works just fine with my two screens, using the very same cable I used with the older Mini. Bugger...
FYI, I tried 720p : no picture either.
Does the Panasonic's user guide make reference to making computer connections over HDMI? It could be that only one of the HDMI inputs on the TV is designated for computer input, e.g. only one of the TV's HDMI inputs can work from a non-HDCP compliant source.
I do think I tried all 3 inputs, and the user manual never suggests that one of them is designated for computer input (I know some Samsung screens work that way, but this Panasonic doesn't seem to). Anyway, I'll give it a try once more, but I have little hope...
Meanwhile, I connected my Mini via VGA, 1366x768 resolution. Not too bad when viewed from the sofa, but it kills me not to be able to use the digital input...
Thanks for your replies, though

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VGA/SVGA Display
------------------- RAW DATA ------------------------
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 | 00 FF FF FF FF FF FF 00 09 AD 38 02 BD E7 00 00
1 | 30 0B 01 01 08 1E 18 64 E8 17 26 A0 61 58 9A 2E
2 | 27 54 39 AD CE 00 01 01 01 01 01 01 01 01 01 01
3 | 01 01 01 01 01 01 C3 1E 00 20 41 00 20 30 10 60
4 | 13 00 1E 16 00 00 00 1E 64 19 00 40 41 00 26 30
5 | 18 88 36 00 1E 16 00 00 00 18 00 00 00 FD 00 3C
6 | 4B 1F 3C 08 00 0A 20 20 20 20 20 20 00 00 00 FE
7 | 00 46 58 57 4A 31 42 30 32 35 39 33 32 35 00 66
< 00FFFFFF FFFFFF00 09AD3802 BDE70000 300B0101 081E1864 E81726A0 61589A2E 275439AD CE000101 01010101 01010101 01010101 0101C31E 00204100 20301060 13001E16 0000001E 64190040 41002630 18883600 1E160000 00180000 00FD003C 4B1F3C08 000A2020 20202020 000000FE 00465857 4A314230 32353933 32350066 >
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Max V Size..........24 cm
Gamma...............2.00
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Composite Sync
Color info:
Red x = 0.625 Green x = 0.345 Blue x = 0.180 White x = 0.329
Red y = 0.380 Green y = 0.604 Blue y = 0.154 White y = 0.225
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640 x 480 @ 60Hz
640 x 480 @ 72Hz
640 x 480 @ 75Hz
800 x 600 @ 60Hz
800 x 600 @ 72Hz
800 x 600 @ 75Hz
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1024 x 768 @ 70Hz
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Horizontal Vertical
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Sync Width.............. 96 pixels 3 lines
Back Porch.............. 176 pixels 28 lines
Blanking................ 288 pixels 32 lines
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