With only this few information on what exactly you did, it's almost impossible to help you. But chances are that your drive has died now. If the eject button still works or the drive LED flashes, it should be possible to get your drive back to life again. Otherwise you probably have to replace it.
BTW: Flashing usually does NOT help if some kind of disc is not recognized at all. This usually means something is broken and your drive needs to be repaired/exchanged.