Bunch of question:
DOS or Windows CE-27 software?
Repeater button pushed and green LED on?
Remote button not pushed and green LED off?
Monitor button pushed and green LED on? (Temporary to verify basic operation)
Accessory not pushed and green LED off?
Local TX with mic attached?
Confirmed no controller inside the unit?
White noise with monitor pushed and squelch all the way down?
Channel set to the info you programmed?
All Channel spacing are set the same? 5k W / 2.5k N (service you're using?)