sat nav repair Honda Accord 2004?

Hi evry1, i jus bought Accord 2004 2.2icdt exec with touch screen sat nav but it came with no nav disc its expensive from dealer so i bought 1 from ebay but the problem is it dont insert in 2 the dvd rom i pressed the eject buttn 2 see if anything is already in there but it jus makes a whining noise nothing comes out. on the screen it says insert dvd or dvd error........ can any1 help or advise me on what to do or tell me what seems 2 be the problem....