It is almost uncommon for the Mach 460/1000 systems not to have issues. My 460 6 disc went out on my 03 five years ago. I had the same symptoms you are having.
I took the head unit out and tried to fix the loading mechanism but I never got it to work.
I bought an Ipod/mp3 adapter that uses the radio. I would suggest going that route or installing an aftermarket head unit.
My Mach 1 also has the 460 6 disc but it still works. I think they wear out based on usage.
Also, welcome to the site! Nice to see another Wisconsinite join.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.