There are 2 Power sources you need to check on the Plug
Wires are:GREEN / Purple = 12 Volts Constant +YELLOW / Black = 12 Volts Ignition +
If the Voltage Checks O.K. then the Problem is Internal (*typical) & the Unit needs Repair. These Radios need the Ford Upgrade Display & Board. Cal your Ford Service & ask if anyone Repairs Locally, if not you will have to Ship. If you can't find a Repair Shop, let me know & I will Post a couple of 800 Numbers for Repair or Replace.Repair Est. $ 97.00 - 185.00 depending on Shop.
These Repair Shops have been in business for MANY Years & I have had NO problems.