driver2 won't play disc 2

[knite]

both my backups work. i use a game enhancer.
both discs boot up the first one lets me play the game. the 2nd disc boots up and tells me to put the 1st disc in. well when i finish disc1 and put 2 in nothing happens, the disc just spins. can any one help me in getting the 2nd disc to start playing?