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I remember my mother calling me with a machine that was making horrible noises and shutting down randomly. I told her to kick it. It took a few minutes for her to believe me. And she did. And the noises went away and it worked fine. I don't think I ever explained to her why I prescribed that remedy...

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The old Apple IIe’s used suffered from an occasional manufacturing defect that would cause the chips to be slightly disconnected from the main board. The recommended fix was to pick it up a few inches off the desk and drop it to re-seat the chips.

Apple ][+ too. In addition those 72x chips would fail with time. We figured out that a can of compressed air was handy.

Power on. Wait for machine to freeze. Spray a chip with compressed air to cool it. Try again. If it stayed working it was probably that chip.

Thank goodness they were socketed.

That was the Apple III.

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