6. Drill 4 holes on the ceiling, and then select 5x40mm tapping screws to fasten the cable box on the ceiling. (Recommendation: cable box must be installed above the power input of screen) (figure 10-11). Gelling Tapping Screw Figure 11 7. The screen includes two parts of cable; there are cable box and main cable. Firstly, please insert the plug into socket (figure 12-13). Figure 13 8.