Need Help - Mac Mini no longer works with LG Television

Sometime ago (maybe about two months), my Mac Mini quit working with my LG Plasma HD TV. Currently, when I try to use the Mac Mini with the television, the screen displays a "no signal" message.
The Mac Mini is a one year old Intel Core Duo and is connected using a DVI to HDMI cable.
I've troubleshooted:
1. Connected the Mac Mini to our 42" Sharp Aquous LCD - it displays fine.
2. Taken the Mac Mini to the Genius bar. It displayed on the genius' Apple display w/no probs.
Since then, I've tried:
1. Reinstalled/rolled back to Leopard DVDs (no updates applied) - No luck
2. "Driving" the Mac Mini via Screen Sharing using my MacBook and monkeying with the Display preference pane. While screen sharing, I tried using SwitchResX, too (not too certain of the settings though) - No luck.
Of note:
1. Before the trouble began, I was pleasantly surprised to see "LG" (automatically) listed as the display in the Display preference panel. Support was literally plug and play. Currently, when I drive via Screen Sharing, "LG" is no longer listed. Alternatively, when I connect to the Sharp Aquous, the Display preference panel DOES list "Sharp" as the display.
Any ideas?

I'd be interested in any resolution here. Here's my story:
I have a Mac Mini model MA723LL/A and a Haier P42LV6-T1 42" HDTV plasma with VGA and HDMI inputs. I first attempted to hook the Mac to the plasma TV using the DVI->VGA adapter that came with the Mac. I got no image at all on the TV, and the TV claimed 'No Signal'.
Then I used a DVI->HDMI adapter, and hooked the Mac to the TV thru the HDMI port. I got a picture and was happy. I setup iTunes, got the wireless working, surfed the web a bit and all was OK except the resolution seemed wonky. So I opened the Mac's settings panel to adjust the resolution, and as soon as I opened the settings panel, the screen went blank, with the TV claiming 'No Signal'. I shut off the Mac and rebooted, and from that point forward, what happens is this:
press On Button->
Apple Boot Screen->
MacOS 10 loading->
desktop For About 1 millisecond->
screen goes blank with TV claiming 'No Signal'
I hooked the Mac to my Dell 20" LCD monitor thru the monitor's DVI input and got a great picture. I tested all the resolution settings, and everything was fine. I have tested the Mac on the TV with all available resolution settings and it's always the same story (see above for sequence)
I'm kinda at the end of my rope. The Mac seems to be changing something on its video output at the end of its bootup, but I have no clue what. Has anyone seen anything like this? Any advice at all?

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System Information
Time of this report: 9/4/2012, 01:32:48
       Machine name: LAPPY_TOPPY
   Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
           Language: English (Regional Setting: English)
System Manufacturer: TOSHIBA
       System Model: Satellite L675
               BIOS: Phoenix SecureCore Version 2.30
          Processor: Intel(R) Core(TM) i5 CPU       M 450 @ 2.40GHz (4 CPUs), ~2.4GHz
             Memory: 4096MB RAM
Available OS Memory: 3954MB RAM
          Page File: 2016MB used, 5890MB available
        Windows Dir: C:\windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7601.17514 64bit Unicode
Display Devices
          Card name: ATI Mobility Radeon HD 5650
       Manufacturer: ATI Technologies Inc.
          Chip type: ATI display adapter (0x68C1)
           DAC type: Internal DAC(400MHz)
         Device Key: Enum\PCI\VEN_1002&DEV_68C1&SUBSYS_FD001179&REV_00
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   Dedicated Memory: 1014 MB
      Shared Memory: 1721 MB
       Current Mode: 1600 x 900 (32 bit) (60Hz)
       Monitor Name: Generic PnP Monitor
      Monitor Model: unknown
         Monitor Id: LGD01CA
        Native Mode: 1600 x 900(p) (60.080Hz)
        Output Type: Internal

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