The YouTube video works. But the link is bad/wrong.
YouTube Link manually (because the forum software automatically tries media embedding and this fails in ASK!
It sounds like some kind of rattling in the drive.
Open the Wii, have a look at the drive. Any junk inside? Look what happens inside the drive while open (I don't know if it turns on the laser directly on power on –
so DON'T look into the lens!!)
-- or --
Simply ignore it and don't use the drive at all. Sooner or later all the lasers will burn out and the mechanical parts age. USB loading should keep our Wii consoles alive for quite some time.
Good luck and have fun!