I have two Amstrad GX4000's

One power supply - "Altai" brand, supplies a voltage which should be enough to power a GX4000

I made up an RGB scart cable suitable for the GX4000 however when I put a cartridge in, plug it all in, and turn it on, it changes to AV automatically as it should, but the game doesnt load, its just black and white wavy moving lines..

I tried turning it on WITHOUT a game in, and it does the same thing.

This led me to believe that the cartridge may be dirty, so I cleaned it.. still doesnt work.

Both GX4000's do the same thing.

I opened the game cart "Burnin' Rubber" and noticed it contains an EPROM, im wondering could it be that the EPROM has ceased to function/lost its data? (the UV window is covered up.. but..)

I cant think of anything else, and have no more games to test!