How can I get my USB working?

I realize this has been asked before but none of the solutions I've read has worked.

Phone: Samsung Exhilarate I577 (yes, old).
System: Android 4.0.4

Suddenly the USB stopped working. I connect the cord to the computer, hear that little noise the phone makes (so it is detecting something) and....nothing. The computer doesn't indicate that it is detecting the phone.

I used to be able to download music easily - now it's impossible. Forget Kies, what a piece of junk. Don't even mention it, thanks.

What is going ON????

I've done the USB utilities, developer options - I even factory reset my phone but nothing is working!

If someone could just supply an explanation for this baffling phenomenon I would be grateful.

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