[fnordfnordfnord]

Stupid Wii power supplies, these are known to be pieces of junk. I keep a spare for this reason. Simply letting it "rest" unconnected for some unknown duration also does the trick.

[outworlder]

That's probably an open polyfuse. Unlike the fuses of old, the new ones actually regenerate themselves (re-crystallize).

[fnordfnordfnord]

That is a good idea. I should have thought of that. Thanks.

[danielweber]

I heard it as the Wii power supplies are very protective against surges at the cost of being extremely sensitive to surges. I've done the "unplug it completely for a few minutes" to restore functionality a few times.

[fnordfnordfnord]

They are definitely too sensitive. Fortunately a second one may be had for less than ten bucks.