It sounds like you have a calibration bug with the light sensor that controls the eject button. Try turning off all the lights in the room, and attempt to insert a disc again. If it is the light sensor, you should be able to insert and eject a game without it repeatedly ejecting. Let me know what happens, and we will go from there.
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Note; Make sure you start with the system off, before you turn off the lights in the room.
It sounds like you have a calibration bug with the light sensor that controls the eject button. Try turning off all the lights in the room, and attempt to insert a disc again. If it is the light sensor, you should be able to insert and eject a game without it repeatedly ejecting. Let me know what happens, and we will go from there.