sony hcd-rx66. my stereo turns off when i turn it on?

how can i fix my stereo? when i cut it on it "tape a" then it clicks a few times then it says "eject" then it shuts off showing the time. if i press the funtion button on start up a few times i can get the stero to stay on but when i do that, trying to play a tape in the cassete player makes the display say "eject" then it shuts right off again. im sure this problem is coming from the cassette player itself. model hcd-rx66 sony.