My wii spits my disc out after i put it in system
I've found that this is usually caused by a problem with the small plastic gears that operate the loading mechanism. Sometimes they break, need to be realigned, or get stuck.
If one or more of them have a problem then the loading mechanism never allows the disc to drop onto the motor to spin. Then the Wii realizes that the disc did not load properly and kicks it back out.
But the only way to see is to take the Wii's cover off.
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