Removing The Power Supply - Lenovo IdeaCentre B345 Hardware Maintenance Manual

Step 9. Remove the five screws that secure the system fan to the heat-sink and lift the system fan up to
remove it.
Step 10. Separate the defective fan from the good one as shown.
Step 11. To install the new system fan:
a. Line up the new set system fan with mounting holes on the motherboard.
b. Secure the system fan with five screws.
c. Connect the fan power cable to the connectors on the motherboard.
Step 12. Reattach the EMI cover, middle cover, optical drive, computer stand and the rear cover.

Removing the power supply

Attention: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
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IdeaCentre B345–B545 All-In-OneHardware Maintenance Manual