I got a refurbed dvd drive from a guy on ebay who fits new laser to them.
I fitted it this afternoon and still getting insert navigation disc message and it wont eject the disc. At least my old unit would eject the nav disc you could say im very displeased any got any ideas what the problem is.

Dave

 

Have you contacted the guy you bought the unit from? What does he say? I'd start there.

 

Well i did contact him and he asked me to send it back so i took the unit out and low and behold as i slide the drive out the large blue ribbon connector was not connected.
So after all looks like i did not connect it properly when i first changed the drive DOH !
When i fitted it back in the unit worked perfectly i feel a right idiot.

Dave

 

At least it was an easy, no-cost fix (other than your pride).