When I bought my first A4000, back in 1994, I bought it from a rather dodgy character of a certain ethnic minority that does not have a reputation for honesty. I tested it in his house, it ran OK, but once I got it home, I found that after an hour of running with the case on, it used to slow down and finally stop.
There was an animation on some PD disk of a dog running. If I left this anim running, it would show the slowdown effect quite dramatically. With some freeze spray, I traced it to one of the PGAs under the CPU card. It cost less than $10 to have it replaced with a later version, and I've never had any trouble in the ten years since then.
tony
