KK25
Still Fresh
It definitely sounds like a capacitor is on the way out. If you are handy with a soldering iron at all, there are a group of 8 or so capacitors bunched up around the two AV outputs. I can't remember which ones do what, but seeing as there are only a few there, it might be worth your while just replacing them one at a time and seeing if your image improves. You could also try the second AV output on the back of the Gamecube. The ports are slightly different, so you would need to have the appropriate cable.
If pulling your Gamecube apart sounds like something you would like to try, you'll need a large 'Gamebit' to open it up (there are generally two sizes. One for cartridges and a larger one for consoles).
Failing those options, it shouldn't cost a great deal to buy another Gamecube. You could consider PAL or NTSC versions. If you went with an NTSC (Japanese or American) one, make sure that you keep hold of your current power supply to use with it.
If pulling your Gamecube apart sounds like something you would like to try, you'll need a large 'Gamebit' to open it up (there are generally two sizes. One for cartridges and a larger one for consoles).
Failing those options, it shouldn't cost a great deal to buy another Gamecube. You could consider PAL or NTSC versions. If you went with an NTSC (Japanese or American) one, make sure that you keep hold of your current power supply to use with it.