Just purchased a 2006 Mark LT, it appears that previous owner had replaced OEM radio with something else and before trading in the Mark, had reinstalled the OEM radio. everything in the HU appears to function except NO SOUND., pulled HU and checked cable connectors (seem to be OK), checked fuses, replaced fuse to SubWoofer.
ANY IDEAS?

 

this might sound like a dumb question but do you have speakers in the door?

did the previous owner have amps hooked up for the door speakers, and maybe cut the wires?

 

Do not know. Assumed so, no external sign of cut wires, but will check as soon as snow stops.
Thanks