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Gamecube - GameCube System cheats

New starting sounds #1
Hold Z when the Gamecube logo appears

New starting sounds #2
Hold Z then about one second later hold A.

Switch between refresh rates:
When you turn ON your gamecube system, hold B until the 
message "Would you like to switch to 50hz mode?" (for PAL games) 
or "Would you like to switch to 60hz mode?" (for NTSC games)
appears. 

Control starting logo
While the cube bounces down, hold A to form the "G" logo to spin 
it.

Set system time and options
When you turn ON your gamecube system, hold A or hold A while 
the cube rolls around the screen.