How to repair window switches not working on any windows?

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None of the window switches work to turn windows up and down. I replaced the driver door window switch motor, but it didn't help. Ive had this problem on and off for years, but lately the windows-none of them will work at all. Yes, I know there is a window lock button on the door switch and that is NOT the reason for the problem but no mechanics can tell me what needs to be done. Can you help?