Just realized the guy at the counter was right about checking the battery door spring first
I was in my shop on Saturday morning with a Canon AE-1 that the owner swore was dead. I figured it was a winding issue and had the bottom plate off before I even put a battery in it. The old guy who runs the camera store two blocks over poked his head in and asked if I checked the battery door spring first. Turns out it was bent just enough to break contact, a two minute fix instead of the two hour teardown I started. Now I keep a spare spring in my bench drawer and I want to know what simple thing you all check before going deeper.
The bent battery door spring is a perfect example of how the small stuff trips us up more than the big stuff ever does. I've seen the same thing with clogged dryer vents, a five dollar part that people ignore while they shop for new machines. My neighbor spent a whole weekend replacing his faucet when the real problem was a worn washer that cost about fifty cents. Even with my truck, I once tore apart the whole starting system before my brother pointed out a loose ground cable. We love to jump straight to the hard fix because it feels more like real work, but half the time the answer is sitting right there in front of us, cheap and obvious.