Intel iMac won't recognize external display with Dynex mini-DVI adapter

I've got an original Intel iMac with a Mini-DVI connection on the back. I'm attempting to hook it up to an external display (a plasma screen, in fact). I picked up a Dynex Mini DVI to Video Adapter DX-AP100 for Apple. This connector has a mini-DVI connector on one end, and both a video-out and an S-video-out on the other.
When attempting to use the adapter, the iMac does not recognize that there is an external display connected. Here are the facts:
The external display: I've tried this with a Panasonic Plasma screen connected directly through S-video, as well as a Pioneer receiver (one that switches video) connected both through s-video and composite video. And yes, I've got the settings on the TV correct. I've also tried this with a Polaroid LCD TV connected via S-video and composite video.
I did notice that when I click "Detect Displays" while the Plasma was connected, the plasma briefly "flashed", implying SOMETHING was happening, but still no dice.
Anyone have any experience with this Dynex DX-AP100 that could share some wisdom?
OS: v10.5.6
System Profiler:
ATI Radeon X1600:
Chipset Model: ATY,RadeonX1600
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 128 MB
Vendor: ATI (0x1002)
Device ID: 0x71c5
Revision ID: 0x0000
EFI Driver Version: 01.00.068
Displays:
iMac:
Resolution: 1440 x 900
Depth: 32-bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Built-In: Yes
Display Connector:
Status: No display connected

Yeah, I realize S-video is limiting, but I'm trying to keep things as simple as possible. The TV is mounted to the wall and there are not currently any DVI or HDMI cables coming out of it. There's an S-video input from my receiver that I'd prefer to use since it's readily accessible already. In the end my goal is to use Netflix "Watch Now" on the TV, so I'm not too worried about video quality.
and before someone asks if I considered that the receiver's S-video input might be the problem...I tried taking the s-video wire from the stereo and plugging it directly into the adapter. No dice.
ONE ADDITIONAL PIECE of information...while trying to get this to work on an LCD monitor, I plugged the composite video connection from the TV into the adapter. Suddenly the Mac recognized an additional monitor, but it saw it as a VGA monitor, not as s-video or composite video, and no signal went to the TV.
I'm considering trading in this adapter for a mini-DVI to VGA adapter, but that really won't help me with the connection to the TV.

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