HDMI (Best quality, easiest on modern TVs): Requires a GameCube-to-HDMI adapter (e.g., Kaico, GCHD Mk-II, Eon GCHD). Plugs into GameCube's digital AV port → HDMI to TV. ~$50–$100.
Composite (Included with console): Red/White/Yellow RCA cables. Works on any TV with composite input. 480i only.
S-Video (Better than composite): Requires official Nintendo S-Video cable (model NUS-008) or quality third-party. 480i, separated chroma/luma.
Component (Best analog, NTSC only): Official Nintendo Component Cable (model NUS-010) — extremely rare/expensive ($200+). Outputs 480p. Only works on NTSC GameCubes (US/Japan).
3. Connect & Select Input
Power off TV and GameCube.
Connect chosen cable/adapter.
Power on TV → select correct input (HDMI 1, AV, Component, etc.).
Power on GameCube. Image should appear.
Tips
For HDMI adapters, buy from reputable brands—cheap ones introduce lag/artifacts.
Clean the GameCube's AV port with compressed air if signal is unstable.
On modern TVs, HDMI may not fill screen perfectly (overscan) or show minor jailbars—this is normal for analog-to-digital conversion.
Component cable is the holy grail for purists; a good HDMI adapter is the practical choice for 99% of users.