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Lets try some simple steps first.
Eject the disk. Check it for scratches, smudges or fingerprints. gently clean any smudges or fingerprints.
Now, turn the wii off. Unplug it from power.. After its unplugged from power, wait 30 seconds.
Then plug it back into power, then turn it on. Once powered up insert the disk.
can it read the disk now?
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