I am not suggesting any misleading anywhere. The OP was doing preliminary troubleshooting. Always start with the most likely fix and then move on. If the routine things don't resolve the problem then I recommend taking it to a mechanic. But first do the simplest thing which is to "rebbot" the machine if you will. Un-thread the entire machine, do a quick surface clean and re-thread. Frequently that will solve the problem. If not then you need to look deeper.
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