Gamecube (hardware)

Alternate starting sounds:
Hold Z while the Gamecube logo appears to hear new sounds.
PartidaEd.

Hold Z then about one second later hold A to hear another sound.
GOOBERBOY16.

Insert four controllers then hold Z on each of them while the Gamecube logo appears to hear different sounds.
kathan jackson.

While turning on the Gamecube, hold Y + Z to hear a strange sound while the cube is formed.
Darth Rage.

Control starting logo:
Hold A while the cube bounces down to form the "G" logo to spin it.

Set system time and options:
Hold A while powering on the system.
SStreetFighter0.

Alternately, hold A while the cube rolls around the screen.
HotdogNBizkits.

Alternately, turn on the Gamecube without a disc. Wait until the opening sequence is over and you will be able to set the time and date on the system, delete memory files (if there is a memory card inserted), and set the sound and screen position.
Max Josephson.

Alternately, leave the disc lid open when powering on the Gamecube. The options menu, where you can view memory card data, set the time, and check sound options will appear.
Chris Snow.

Change screen refresh rate:
Hold B while powering on the system until the message "Would you like to switch to 50hz mode?" appears. This allows you to switch the screen refresh to match that of PAL games. If playing on a PAL system, the message will be "Would you like to switch to 60hz mode?", allowing the screen refresh to match that of NTSC games.

Re-calibrate controller:
Keep the Analog-stick steady and hold X + Y + Start for about five seconds to re-calibrate the controller without the need to unplug it.
alelie.

In-game reset:
To restart the Gamecube in many games, hold B + Y + Start at the title screen.
Wilko2205.

Use the Game Boy Advance to Gamecube link option without a Game Boy Advance:
This trick requires two Gamecubes, two televisions, and at least one Game Boy Player. The purpose of this trick is to eliminate the need for a Game Boy Advance and also use the special function it provides on a television screen. Attach the Game Boy Advance to Gamecube cable into the link cable slot in the Game Boy Player (without a game in it) that is attached to the other Gamecube (on which the game with the special options is played, such as the Tingle Tuner on Legend Of Zelda: The Wind Waker) or put in the required game that may be required for other options (such as the Metroid Prime and Metroid Fusion hookup).
Evan Hickey.

Big controller:
The action pad included with Dance Dance Revolution: Mario Mix acts as the lower D-pad. You can use it on other games that use the simple D-pad (for example, Sonic Mega Collection, Sonic Gems Collection, etc).
Launcher01.

Famicom Disk System reference:
When sped up about twenty five times, the sounds from the Gamecube's menu become the same melody heard in the BIOS menu of the Famicom Disk System. [Video]
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