stucked dvd

trying to watched the dvds from the exercise ball package, but the dvd got stucked in the dvd drive making noise without responding. the computer froze too. so i turned off the computer, but on restart, it went into a gray screen and stopped there. turned off and on several times without success, only hearing the noise of the spinning dvd. a little bit panicked, i searched the internet using my ipod touch. turns out people having this problem too with their macbook pro. there are some suggested solutions. the one worked for me is after turning on the computer, press the eject button down until the dvd comes out. phew!