[pm215]

I have a couple of machines lurking in my collection which worked fine the last time I turned them on, but that was 15 years ago now... I really should do the research on how to make sure I don't accidentally damage them by powering them on if there's a dried up capacitor lurking in the power supply or something. (One of them is acutually genuinely semi-rare: the ICL 3300 was produced as a prototype but was cancelled before it went into production. The PERQ 1 is older and arguably cooler, but more common.)

[krallja]

If any of them have batteries, you should remove those whenever they go into storage. Batteries have the most chemicals, so they do the most damage when they leak. Big electrolytic capacitors are second.

[pjc50]

This happened to my BBC micro, but after I'd cleared away the explosion and bought a replacement cap kit on ebay it worked fine.