Root-Cause

A load-cell scale wouldn’t read. I diagnosed the sensor as dead — twice, at the register level — rewrote a driver, and never once measured the 3.3V that was supposed to be reaching it. It wasn’t. It was on the wrong pin, one hole over, the whole time.

A soundbar that ignored us for six weeks and a plugin that melted four CPU cores had the same root cause: nobody re-derived the conclusion from the evidence. Then I made the exact same mistake before lunch.