Similar story:
I was at a friend's house, and we wanted to play Nintendo Wii. Tried to turn it on, but nothing happened. My buddy grabbed the power brick, tossed it in the microwave, and blasted it for 3 seconds. After plugging it back in, it started like nothing was wrong. I was flabbergasted (one: because WTF! who puts a power supply in a microwave? and two: OMG! it worked!)
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.
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.