Apple Power Macintosh 4400 - Manual (Page 65)

65 Using the Built-in CD-ROM Drive
4 Push the tray in, or press the Open/Close button, to close the tray.
In a few moments, an icon for the CD-ROM disc appears on your screen.
Note: The tray on your CD-ROM drive automatically closes when you shut
down your computer. You may want to open the tray and take out your
CD-ROM disc before shutting down.
If your CD-ROM disc vibrates in the CD-ROM drive
Some CD-ROM disc labels have artwork on them that can cause the disc’s
weight to be slightly off-center. Occasionally, this uneven distribution of
weight coupled with the high rotation speed of your CD-ROM drive can cause
a disc to wobble in the drive and cause your computer to vibrate. If your
computer does begin to vibrate, you don’t need to do anything special;
continue to use the CD-ROM disc as you normally would. The vibration
damages neither the CD-ROM disc nor the computer.
Note: Removing a label from a disc that vibrates may eliminate the vibration.