Power Computing PowerCenter PRO User Manual page 129

5. If the plastic filler panel across the front of the bay is still in place
and you are installing a drive which uses removable media, such as
a CD-ROM drive or a removable-cartridge drive, reach into the
empty drive bay and press firmly on the middle of the plastic insert
to pop it out the front of the computer.
The plastic insert is very flexible and should pop out quite easily.
plastic
filler
panel
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Installing Internal Drives
PowerCenter Pro User's Guide
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