Magnavox 37MF331D/37 LCD

I hooked up my Mini to my LCD tv with a DVI-HDMI cable and I could see the desktop on the tv. It wasn't exactly right so I messed with the display settings and the screen went black then flashed blue. About every 30 seconds the screen turns blue then black again. If i have "info" on the tv turned on, it says 720p during the blue flash then nothing.
I hooked my dvi-composite (rca) to one of the inputs on the tv and got terrible results but i could see the desktop. Upon trying to change the resolution from 800x600 it went black...flash blue etc.
I read all I could find in these forums and here's what I tried.
1. deleted the windowserver plist file in byhost as well as the display one
2. boot holding cmd.option.r.p listen for 3 bongs.
this did not seem to help.
3. booted in safe mode, worked with the nasty rca setting but no sound.
Is there anything else I can try? any suggestions would be appreciated.
BTW I have a monitor that works with the mini and when i swap the cables (during this blue.black.blue thing), everything comes up ok on the monitor like it should.
I am using a component out dvd player on one of the other inputs and it seems to be perfect. I tried unplugging everything except the hdmi and power to the tv to no avail.
mac mini 1.5Ghz G4 (ppc) Mac OS X (10.4.9) 1gb ram
mac mini

Walter, I have mine hooked up to a 40" Samsung LCD with the same cable as you.
I did experience this a couple times (although my flash of the desktop was followed by no image at all) Mine also came after changing resolution (and refresh rate)
Try starting up your mini in safe mode (hold down the shift key right after the startup chime) and your system should show up on your tv. Once you are at the desktop, go to the system preferences>display and set your resolution where you would like it to be. Also, check to make sure that overscan is NOT selected in the system preferences>display>options section. That was what was happening to me. Once I took overscan off I was fine to restart and all worked well (and, oddly enough, I can use overscan at some resolutions with no problems but not at others....go figure)

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