remove the white big flat ribbon cable attached to the USB ( on the right) PCB.

again be careful and use a flat head screwdriver or a spudger to lift up the lever..

remove the audio cable from the connector , be careful if you tear the cables , you will have audio problems and there is a possibility that you will have BSOD ( blue screen of death) ...

remove the FAN cable from the connector , be very carefull because it are very tiny and breakeble cables...