Motherboard connectors pinouts  > Dell pinouts
Similar to Dell Dimension 3100 (no Mic) and 5150 (USB skts are counted from the left)

 

Pin
Number
Pin
Name
Description
1   Headphones   Left
2   Headphones   GND
3   Headphones   Right
4   ?   
5   Mic in   Left
6   ?   
7   Mic in   Right
8   Mic   GND
9   ?   
10   ?   
11   ?   
12   Ground   GND
13   ?   
14   ?   
15   Diag LED 3  
16   ?   
17   Hard Drive LED   -ve
18   Diag LED 2   
19   ?   
20   Pwr LED Green   -ve (note 1)
21   (missing)   'Key'
22   Pwr LED Oragge   -ve (note1)
23   PWR ON   switch to Gnd
24   LAN LED   +ve
25   ?   
26   LAN LED   Gnd
27   PWR ON   Gnd
28   GND   
29   GND   
30   GND   
31   GND   
32   ?   
33   USB #1p4 +5v (note 2)
34   USB #1p3, Data   
35   USB #1p2, Data   
36   Gnd   
37   USB #2p3, Data   
38   USB #2p2, Data   
39   USB #2p4  +5v (note 2)
40   ?   

Note 1. The power LED is a 'bi-colour' type'. The voltage on the control pair is reversed to switch from one colour to the other (so +5v  / 0v is Orange,  0v / +5v is Green

Note 2. The USB 5v fuses are on the motheboard (replacing the front panel board won't fix a blown fuse)

40 pin IDC male connector layout
40 pin IDC male connector
at the Front panel board
According to 1 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Dell OptiPlex 745 & Dimension C521 I/O Panel Assembly pin-out visual pinout:
Dell OptiPlex 745 & Dimension C521 I/O Panel Assembly pin-out diagram
click to enlarge
Source(s) of this and additional information: http://www.sevenforums.com/hardware-devices/63920-dell-dimension-c521-front-panel.html
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