Apple macintosh performa 6200cd series User Manual

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The signal to open the tray may not be reaching the computer. Turn off
your computer and locate the small pinhole to the lower right of the 
CD-ROM tray opening. Insert the end of a large straightened paper clip
firmly and horizontally into the pinhole. Push gently until the tray is
released, then carefully pull the tray open. Do not force the tray open; wait
until the paper clip has dislodged it or you may break the front of the tray.
If neither of these suggestions works, your CD-ROM drive may be damaged.
Contact an Apple-authorized service provider or Apple for further assistance.
Your computer won’t restart, and  a CD-ROM disc is in the CD-ROM drive.
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Your computer may be trying to start up from the CD-ROM disc. Press the
Open/Close button of your CD-ROM drive to open the tray, and remove
the CD-ROM disc. Close the tray, then restart your computer.
Problems with CD-ROM discs
You insert a CD-ROM disc, but its icon doesn’t appear on the Macintosh desktop. 
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Make sure that the disc label is facing up and the disc is centered in the
tray. If you’re using a small (8 cm) disc, make sure it is within the tray’s
inner ring.
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Make sure the tray is closed all the way.
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Try restarting your computer.
WARNING  
Turn off your computer before you attempt to eject the tray
using a paper clip. If you don’t, you may damage the CD-ROM drive.
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Chapter 6