Mac Mini with DVI to video adapter REFUSES to display on TV!! Please help!!

I purchased an apple DVI to Video adapter - which says for Mac mini and power mac G5 on the package. However not matter what I do, I can't get a picture on my TV, I have tried on 2 TV's and I get nothing but blank screen on both, with occassional grey flicking.
I thought maybe the adapter was faulty so had it changed, the new one shows the exact same behaviour. I have started up in safe mode, with the TV connected and still nothing, I have reset the PRAM and still nothing. Trashed the windowserver plists - and still nothing!!
I have searched through the forums as much as I can and can't find any answers.
Someone please help me out and tell me what I'm doing wrong.
Thanks very much.
Naj

Hi Thesserax,
Thanks for your reply, however I have already tried your suggestions - my tv's do not let me switch manually between PAL/NTSC, and I am definately on the correct channel.
I also tried connecting it to the TV and VNC'ing into it to try to change the resolution, however I although I see the correct CRT resolution opions i.e. 800x600 and 1024x768 only, I notice that I don't see any tv specific options such as overscan, and that the rates are stuck at 60Hz (NSTC) - I am in europe so the tv is PAL 50Hz and the adapter is also labelled PAL.
Any other ideas, please?
Thank you

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