Help, how can I remove Interference on tvout signal?

[jubei]

Hello

I have a XFX GeForce 6800GT video card and my TV out signal has bad interference on it (diagonal scrolling lines). I am using PAL\B as I live in Australia. NTSC also works and the interference is differnt (diamonds scrolling). The card outputs svideo. I am using an svideo to composite adapter cable and a coposite extension cable to plug it into the RCA jacks on the front of my TV.

The other day I replaced my CD burner with a DVD burner and after I did that the interference went away for a day but came back the next day :confused: .

What should I do to get that crystal clear picture back?

Thanks

Jubei

[jubei]

I tried the same setup on a differnt TV (a Panasonic) and the interference wasnt there. I only get the interference on my widescreen Grundig. How can I fix this?

[jubei]

My friend suggested trying it through my VCR. I did this - plugged tvout cable into av in on the VCR and then connected av out from the VCR to the grundig and the picture was very clear. A couple of minutes later the picture quality really degraded badly and now I can only just see it no matter what configuration I use.

Do I have a faulty tvout processor?