Yep, the slap worked the first time but after that it no longer boots at all.

I'm gonna look for a cheap soldering tool to open it up and see what I can do!

Speaking of soldering, do you suggest any particular precaution to take? I'm kind of worried of the CRT and the high voltage capacitors on the analog board, though I've read that apparently leaving it unplugged for a few days should suffice to discharge it completely.

Thanks!