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That drives me nuts sometimes. Like even professionals sometimes seem unable to do basic troubleshooting. I work in live music, I am not a tech/engineer but have done a lot of tech work on and around stages.
Simple stuff like - one speaker is not giving a signal, two techs are unable to identify the fault for over 20 min. I observe for a bit, they check the console, they check the speaker, they check the power supply.
And I, half joking, ask - have you switched sides already? Both look at me like they don't understand my question, I walk over to the signal line for the PA, unplug them both, plug the left side into the right signal and vice versa on the other side - the problem moves from one speaker to the other, so it has to be a faulty cable. I was so baffled by that.
WHY IS THAT NOT THE FIRST THING YOU DO????? It takes seconds!
Or a wireless in-ear system has weird noises in the signal, I suggest to switch the frequency, the old tech grunts at me that he has already done that, I check and he moved the frequency like 10mhz. I suggest to move to a totally different frequency range and he gets rude so I go somewhere else. Half an hour later it turns out I was right. Why do you fuck around with firmware and shit before you do something simpler and quicker?