Connecting to a Samsung TX-R3079WH HDTV w/Mini-DVI to HDMI

Greetings, I have a Samsung TX-R3079WH 30" HDTV that has an HDMI input (which works just fine via cable box input), and I have a Rev C Powerbook G4 12" 1.33 GHz with an nVIDIA GeForce FX Go5200 64 MB AGP graphics card with the mini-DVI output (which works with the converter to a 17" CRT via VGA).
I recently purchased a 4 m Radio Shack DVI to HDMI cable to connect the PowerBook to the Samsung TV. I am connecting the DVI cable through the DVI to Mini-DVI converter from Apple to the PowerBook.
At first, when I had the Mini-DVI/DVI connector attached to the laptop, I had the TV turned off and plugged in the HDMI cable to the TV. I turned on the TV, and my computer's display definitely recognized the external display. The problem initially was probably a refresh rate/resolution problem I guess, since the TV was reporting "No Signal" but the laptop definitely recognized an external display, which had its own icon in the System Preferences Displays panel (running at what looked like 640 x 480, definitely smaller than the native res 1024 x 768 of my primary display).
Anyhow, I didn't recognize what the problem was then, but now when I try and connect the DVI/Mini-DVI to the HDMI, all I get is incessant flashing from my primary display as it tries to decide whether or not there's something attached.
Any suggestions on getting this setup to work? Thanks in advance.

never mind found the mirror display function.

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