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What disc did you load? if it was a game disc, try a different game disc.
If you then get different results, you might suspect your first disc of having a problem: too many scratches, a touch of dirt or too many fingerprints. If so, and if it isn't owing to a cracked disc nor a badly scratched disc, you may be able to repair it yourself using my instructions.
If it was the bootup disc, or it is the only disc you have, examine its surface in good lighting, and see whether it shows any scratches, scuff marks, or worst of all, cracks.
How old is the Wii system/console in question?
Let me know, please, so that I may advise you further.