Perform this task when you have previously removed the fan tray.
Two arrows on the top of power supply bay show where the fan tray aligns.
Verify that the fan tray is properly seated and the top surfaces of the fan tray are flush with the chassis.
See Install a Fan Module.
If you installed the fan tray as part of another component's removal or installation procedure, return to that procedure. See Component Service Task Reference for assistance.
Otherwise, install the top cover.