It’s back in the day, and pilot fish gets an early-morning call. A System/360 Model 65 won’t power back on. The operator tells fish that when he presses the power button, he hears a squealing sound. Could be a mouse, he theorizes, since they’ve been seen around the building.
Fish gives the power button a try, and he does indeed hear a squeaking/squealing sort of sound. Fish figures the quickest way to find the problem is to follow the sound. He has to get around a large structural pillar before he can get anywhere close to the place where the squeak seems to be coming from, so he asks the operator to push the power button while fish takes a look.
Click here for original story, A real Mickey Mouse theory
Source: Computer World