xbox 360 new dvd drive.

[patience]

i recently received an xbox 360 that did not have the original dvd drive it came with what he thought was the original card out of the original drive..i bought a replace drive and i swapped the cards and the drive will not open...i put the card back in that came with the replacement drive and the drive works but only place dvds...my question is if the original card is not working(even if that is in fact the original card), is there a way to get the drive to work..i also have another drive but it is a different model and firmware...im not looking to mod the drive to play burnt games or anything like that, i would just hate to throw away a working xbox 360..thanks