Why's my XBox getting interference?

[vertigo]

'Lo again chaps.
My XBox's picture has recently started getting some diagonal line interference.
I have it connected to a SCART switcher using the official RGB SCART lead.
With no other device attached to my switcher it still has this interference and I've tried connecting it through another slot on the switch box (the good Argos one) and it's still there.
Have also tried connecting directly to the TV and removing the RF TV ariel from the back too, but I still get the faint moving diagonal lines. You can't usually see it unless there's a block of dark colour on the screen like a lot of black, so it's most obvious on the X logo boot screen.
Yeh, I'm being fussy and no, it's not the end of the world, but I want to get rid of it if possible.
Anyone have any ideas?
Is the PSU not shielded enough perhaps?
Cheers.

[Vince]

I get really bad interferance on mine, i can see ghostly images of the tv moving in the background, which winds me up but i don't think theres much i can do about it.

[vertigo]

I don't get that at all and have tested without any other leads attached or appliances plugged in, yet still get the diagonal lines with an RGB lead.

[dvdx2]

most likely the switcher box m8. I had the same issue with the argos switcher with gamecube games. Could also be the rgb scart lead. Use the official microsoft advance scart cable for best results and try and get yourself a decent switchbox.

[cutmymilk]

its the quality of the splitter. I have a bad one too.

[charlesr]

I get that with the normal xbox on my argos 5way rubbish splitter but it's fine when I use the quality 3way argos splitter. Try a new splitter.

[fahrenheit]

Well he said he gets it with a direct connection, so can't really blame the splitter/switch.

Sounds like RF noise, but could be a grounding issue. Unscrew the head of the SCART and prise it apart and check to see that one of the wires is firmly soldered to the outer metal. Also if the Xbox is in close proximity to the TV, trying moving it further away.

Have you removed the top sheilding on the Xbox lid by any chance?

[vertigo]

Yeh, it's NOT the switch box, ok? I have tried other consoles in that slot and the XBox in other slots and the XBox directly into the TV with no ariel or any other lead in and only the XB and TV plugged in.
It's something to do with the XBox.
It's not where the XBox is situated coz it's in the same place it was when there wasn't any picture interference.
I haven't removed any shielding from the console, it's never been opened since it came out of its box completely new. I'll open up the SCART lead and check out the grounding though, sounds like it could be something like that. It's possible that the lead itself is receiving interference from somewhere too though. Perhaps from the people in the flat downstairs? Odd though that if it is that it only affects the XBox.
The pattern of the diagonals i.e. speed and direction of movement varies depending on what the XBox is doing. When it spins the drive up on boot or accesses it the lines go leftwards quickly, otherwise they go slowly to the right.

[yosai]

it's never been opened since it came out of its box completely new.

That's the problem right there. Take the bast apart and induce some nice static on the gubbins inside. Failing that try another AV channel, or another lead (does it happen with the composite lead?) or move the TV xbox to another room and try it. Your neighbours may have installed a mobile phone repeater/booster (or even a ham radio rig ;p) in their flat.