Removing and replacing the system board assemblyImportantBefore you install or remove any component, read “Important safetyinformation” on page v. These precautions and guidelines will help you worksafely.Attention: If your computer has been turned off for a long period of time, thethermal grease between the microprocessor heat sink and the microprocessor mightnot allow them to be separated easily. In this case turn on your computer for a fewminutes to soften the grease.To remove and replace the system board assembly, do the following:1. Turn off the computer and disconnect the power cord from the electrical outletand from the computer.2. Open the cover. See “Opening the cover” on page 10.3. Rotate the drive bay assembly upward to gain access to the system board.4. Remove the PCI riser card assembly along with any adapters. See “InstallingPCI adapters” on page 15.5. Remove the microprocessor from the system board. Go to “Removing themicroprocessor” on page 36. Return here after removing the microprocessor.6. Carefully take note of the location of all cable connections on the systemboard. It will be necessary to reconnect them properly when installing a newsystem board assembly.Note: Take note of the cable routing. It is important to route the cables thesame way when installing a new system board.7. Disconnect the diskette drive cable from the system board by sliding theplastic cable retainer upward to release the cable.34 User Guide
