dvd receiver

It accepts the disc, dvd, cd, vcd with gusto, recognizes what format it is, refuses to spin up and play. I can't find anything on working on one of these, any help would be welcomed

Item(s) for Sale: PIONEER AVH 4500BT (USED) Item(s) Description/Condition: Pioneer AVH-4500BT DVD Receiver Only no Mic http://www.pioneerelectronics.com/PUSA/Car/DVD-Receivers/AVH-X4500BT No Damage, only fingerprints/normal wear on the touchscreen. Rating 8/10 just because its used. Friend...