Thanks, zuiko21!

Yes, I did change every capacitor on the board. I didn't change any resistors, though.

The thing that makes me think thermal issue is that, after the 30-minute shutdown, if I try to start the IIci back up, again, it will power on, but then it immediately powers off. If I wait for a while, then everything is back to normal. That really says heat, to me.

The fact that there is no thermal shutdown system does throw me for a loop, but I suppose it must just be some IC that is experiencing heat failure.

Thanks!

- Alex