Think of it like a car with a starter wearing out, at some point you turn the engine off and it never starts up again, until you replace the starter. Similarly

Think of it like a car with a starter wearing out, at some point you turn the engine off and it never starts up again, until you replace the starter. Similarly bad batteries, corrosion on terminals, etc. Startup is a much different workload on electronics and in the case of HDDs mechanical devices than running. I have an old fan that will need replacing one day that takes about 15 minutes to reach full speed as the bearings are gone. Everytime I turn it off I wonder if the next time I turn it on it will be time to replace it.