Lenovo M5800 Desktop - Manual (Page 92)

10. Remove the microprocessor from the failing system board and install it on the new system board.
See “Replacing the microprocessor” on page 82.
11. Install the new system board into the chassis by aligning the eight mounting studs in the chassis with the
corresponding holes in the new system board. Carefully slide the new system board into the chassis until
it is secured in place by the mounting studs. Then, install the eight screws to secure the system board.
12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new
system board. See “Replacing the heat sink and fan assembly” on page 79.
13. Install all memory modules and PCI cards removed from the failing system board on the new system
board. See “Installing or replacing a memory module” on page 75 and “Installing or replacing a PCI
card” on page 71.
14. Reconnect all remaining cables to the system board. See “Locating parts on the system board”
on page 65.
15. To complete the replacement, go to “Completing the parts replacement” on page 102.
Replacing the primary hard disk drive
Attention:
Do not open your computer or attempt any repair before reading and understanding Chapter 1 “Safety information”
on page 1.
This section provides instructions on how to replace the primary hard disk drive.
To replace the primary hard disk drive, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See “Removing the computer cover” on page 69.
3. Locate the primary hard disk drive. See “Locating internal drives” on page 66.
Note: There is also a secondary hard disk drive bay for you to purchase and install a secondary hard
disk drive by yourself. If you want to install a secondary hard disk drive, use the same way of installing
the primary hard disk drive.
4. Disconnect the signal cable and the power cable from the hard disk drive.
5. Remove the four screws that secure the hard disk drive. Then, slide the hard disk drive out of the chassis.
86 Lenovo M5800 Hardware Maintenance Manual