Dell Inspiron Small Desktop (3646, Mid 2014) - Manual (Page 40)

3 Slide the front I/O panel towards the side as shown in the illustration to
release the clamps from the front panel and pull it away.
1 front I/O panel clamps (4) 2 front I/O panel
3 screw 4 routing guides
5 front I/O panel cables (3)
40