Just to add to all this, a family member who did repair work for over 20 yrs, and a person that does not exaggerate this kind of thing witnessed a CRT implode and put a hole in a basement CMU wall. Someone hit the tip/neck.
This was for a TV im sure, since it was a long time ago. The implosion is of such force everything goes in opposite directions just like a bomb, just with negative pressure from vacuum and nasty gasses. Once of the few electronic devices that can really hurt or kill you in more then one way.
Boiler systems can do this as well, usually only causing damage to internal components. If your working on taking a boiler off line and don't vent it, you can create some really bad negative pressure. its enough pressure to suck a man threw a hatch doing maintenance without follow the SOP. (resulting in death). It was a big boiler.
Safety tech is good now, but isn't enough to completely eliminate human error, just like fixing one of these older models, a simple mistake can result in craziness, not worth it to me fixing such an older computer when I could pick up a working powerbook etc for approx. $100