I was recently talking to a fellow computer technician who owns a bricks and mortar computer shop and has a few techies below him. He told me a story of a very unlikely scenario that occurred when repairing a computer.

The story starts when a customer brought his PC into the shop to get his computer repaired as it frequently kept restarting/shutting itself down.

Reimage: PC Repair. In Minutes
They tried the most obvious solution which was to replace the power supply because bad power supplies can behave similar to this. They left the PC running in the shop with the new power supply in it for about a day with no problems, gave it back to the client who took it home and the next day called them again saying it had the same problem.

They tried the next most obvious thing which would be to replace the ram. They ran many tests on the RAM and it came up fine. The next suspect was a bad motherboard so they replaced the motherboard; the computer still has the problem.

They thought it must be the hard drives or the operating system. So they put in a new hard drive and reinstalled the operating system; same problem.

They suspected that even though the ram came up fine in the tests that it still may have problems so they replaced the ram. The computer still had the same problem.

One of the lower level techs said to the business owner “It is pretty much a new PC. We have replaced everything on this computer except for the case”.
The business owner said “well, replace the case then” and the tech replied “what the hell would that do?”, “just do it”.

So the tech replaces the computers case and the problem never occurred again.

I ask the business owner “So, what was it?” and he said that it turned out to be one of the wires in the front of the case where the LED’s, power and reset buttons are. Although upon visual inspection there didn’t seem to be anything wrong, there was something in there that kept losing contact for a split second.

The moral of this story; never discount the small things no matter how unlikely they are.