HP Dc7900 Service Reference Guide: HP Compaq dc7900 Business PC - Page 157
CAUTION, Installing Guide Screws in the Optical Drive
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4. Install two M3 metric guide screws in the lower holes on each side of the drive. HP has provided four extra M3 metric guide screws on the front of the chassis, under the front bezel. The M3 metric guide screws are black. Refer to Installing and Removing Drives on page 140 for an illustration of the extra M3 metric guide screws location. CAUTION: Use only 5-mm long screws as guide screws. Longer screws can damage the internal components of the drive. NOTE: When replacing the drive, transfer the four M3 metric guide screws from the old drive to the new one. Figure 8-31 Installing Guide Screws in the Optical Drive 5. Position the guide screws on the drive into the J-slots in the drive bay. Then slide the drive toward the front of the computer until it locks into place. Figure 8-32 Installing the Optical Drive Drives 145