aquaticace

i bought a MZ-N420D from a friend of mine with 10 discs. so i connected it without a disc in it to my PC and installed the drivers and sonicstage reads that there is a Net-MD connected. So i put a disk in and my MD says PC>>MD, but then SS just says please insert disc while my MD is still just spinning the disc around with the spinning disc pic twerling around. anyone know what the problem is? does the MD just not read the discs anymore cause there is no music on them?