Installing and Replacing Desktop Board Components 
45 
Connecting to the Internal Headers 
Before connecting cables to the internal headers, observe the precautions in “Before 
You Begin” on page 
25.  Figure 23 shows the location of the internal headers. 
 
 
 
Item Description  Item  Description 
A  IEEE 1394a   E 
Alternate front panel power LED  
B  Front panel audio  F 
Front panel 
C  Serial port  G  USB 2.0 
D 
Chassis Intrusion 
 
 
Figure 23.  Internal Headers