I picked up a Classic II yesterday for $3 at a church rummage sale. Today I finally got the chance to power it on and check it out. Unfortunately I was greeted with this:

No bong no resone from the KB/Mouse, and nothing but a cramped blank screen.

So I opened it up and saw some capacitor goo, expected, and some corrosion. I cleaned up some of it with some alcohol and a q-tip. I tried it again, but to no avail. Here's a picture of the worst corrosion.



So I remembered a spare Classic I board, and tried it in place of the II board. It turned on to this:

Partial success!

I'll make a post in the compact forums, but does these symptoms ring a bell to anyone?