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The most likely cause for this is stripped gears within the lens.This will require complete disassembly to repair and can be done fairly inexpensively. However, it's not really a user serviceable problem and should be doneby a qualified service technician.
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lots of compressors make strange noises and run for years. I hate to suggest installing a hard start kit simply because I always wonder what we did before they came out with a hard start and machines lasted longer BUT, check amps on start up, amps while running, watch amps for a bit while it's running, install hard start kit. just like all mechanical equipment, it may last 5 weeks, it may last 5 years. Best Wishes!!
Sounds like the focus mechanism is broken on that lens. There's a small screw on the back of it where it meets the camera body, the motor in the camera body turns that screw to autofocus. To me it sounds like the screw is turning, but the lens isn't focusing. You said it also doesn't focus in manual mode, so there is probably something inside the lens that needs repair or replacement. Your best option is to take it to a camera repair shop and ask them for an estimate, camera lenses are not the kind of thing you can take apart and fix on your own. Hope that helps.
This will need to be repaired, The issue here is with the autofocus hence the lens is trying to autofocus but cannot, would never recommend a hair dryer. What needs to happend is bring this guy into a local camera shop to have it taken care of, hair dryer in this case will not work and could damage it further,