A/C Air Handler hum before fan starts question

Recently replaced my inside A/C fan motor and blade (the cylindrical blades inside the squirrel cage).

Since replacing, I've noticed there is a brief hum or buzz noise immediately before the fan kicks on.

My professional but novice ignorant evaluation is the capacitor is giving me an "end of life" warning. It might be a normal noise, but was not present prior to changing the motor/blade.

I'm not sure why I think this, something I learned once probably is suggesting it. Cannot figure out how to search specifically enough in the googles for a straight answer.

Any suggestions appreciated!