A tale of an SGI Indy, a Sony power supply, and how to keep the fan spinning

Let's not dwell on why I bought an SGI Indy. Anyway. One of the common things that I've seen is failure due to power supplies or heat death. The irony is: The Nidec power supply has dirty power, fails hilariously, but the fan is at least always spinning, and The Sony power supply has clean power, less hilarious failures, but the fan only comes on when the unit is hot. Sometimes. The fan in the…