"It's big iron days at a military base, recalls pilot fish who was there, and a new, bigger and faster mainframe computer is installed in a somewhat temporary computer center.
Installation goes great and everything checks out OK.
Until a day later, when the new mainframe dies. Shortly after, it is brought up and it runs fine again.
Until the next day, when it dies once again. Engineers are on site and check things out. All diagnostics run with no errors; the system is good.
Until the next day ... same thing..."