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I've had no such problems using a US PSX so does anyone have any idea why the US N64 wont work on the same TV?
Are you sure the console is working?, take the console apart and make sure all the wires are in its place and not short circuiting.
Or try using it on someone elses TV, cleaning out the cartridge port by blowing and make sure the scart cable is working properly.
Are you using the yellow lead on the scart cable because that's the 'video out' which could explain why you're not getting any picture.
Biggles