If you have had your Nintendo Wii for a while now, there is a good chance that it has just stopped reading discs or is having great difficulty or has gotten very noisy. Sometimes a laser lens cleaner disc will fix it, but often times it doesn’t. You *could* send it back to Nintendo, but they’ll charge you an arm and a leg to fix it.
Fortunately, you can replace the drive yourself for ~$35. It’s not hard to repair a Wii. If you can handle a screw driver and are gentle with things, you should have no problem replacing the drive.