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Two things you may try:
1. There may be a small 'pin hole' in front, under the tray. Push a paperclip in there and it will open the tray.
2. Power the computer OFF. Go inside the hard drive and disconnect the power wire or power ribbon of the CD player/recorder.
Turn computer on again and wait until everything loads.
Re-connect the power source to the CD player/recorder.
Restart computer.