Lenovo ThinkCentre E50 Hardware Maintenance Manual - Page 147
Reinstall the drive bay assembly and connect the power and signal cables
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17. Lower the microprocessor retainer. 18. Lock the retainer with the small handle to secure the microprocessor in the socket. 19. Install a new retention bracket for the heat sink by aligning the posts on the bracket with the holes in the system board and pushing the posts through the holes until the retention bracket is secure. 20. Install the new system board into the chassis and align the screw holes with those in the chassis. Insert and tighten the screws the were removed previously. 21. Reconnect all disconnected cables to the system board. See the system board illustration for your machine type at "Identifying parts on the system board" on page 123. 22. Reinstall the hard disk drive. See "Replacing the hard disk drive" on page 150. 23. Reinstall the drive bay assembly and connect the power and signal cables to the drives. 24. Reinstall any PCI adapter cards that were removed. See "Replacing a PCI adapter" on page 129. 25. Reinstall the fan duct on the heat sink fan. 26. Go to "Completing the FRU replacement" on page 154. Chapter 9. Replacing FRUs (Desktop computers) 141