Lenovo ThinkCentre M90p Hardware Maintenance Manual - Page 120

8. Slide the power supply assembly to the front of the computer and then lift it out of the chassis. Figure 52. Removing the power supply assembly 9. Install the new power supply assembly into the chassis so that the screw holes in the new power supply assembly align with those in the chassis. 10. Install and tighten the four screws to secure the power supply assembly. Note: Use only the screws provided by Lenovo. 11. Reconnect all the power supply assembly cables to the system board and each of the drives. 12. Secure the power supply assembly cables with the cable clips and ties in the chassis. 13. Go to "Completing the parts replacement" on page 127. Replacing the heat sink Attention Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to: http://www.lenovo.com/support This section provides instructions on how to replace the heat sink. CAUTION: The heat sink might be very hot. Turn off the computer and wait three to five minutes to let the computer cool before opening the computer cover. To replace the heat sink, do the following: 112 ThinkCentre Hardware Maintenance Manual