Make sure your deck is in remote mode and that it is receiving its correct machine control standard signal from PostConform. Reseat both ends of the serial 9-pin cable leading from the computer to the deck in use.Note: For machine control of external decks, PostConform requires either a Mac serial port, a qualified modem-to-serial port adapter or USB-to-serial adapter. For modem-to-serial conversion on Blue & White G3 and G4 Macintosh computers, Digidesign currently supports the Griffin gPort, gPort II and the GeeThree Stealth Port and Stealth Port for G4 - AGP video. For USB-to-serial conversion Digidesign qualifies the Keyspan USB Serial Adapter with driver v1.7.2 or higher available at: www.keyspan.com