HP DC5100 mobo

Found a P-IV mobo in my workshop and built a machine ideal for fooling 
around with older operating systems. Original case long gone so I'm 
trying to figure out the headers.

On bootup I get a message that front panel USB and sound not present and 
I have to hit F1 to continue, There is no BIOS option to ignore faults.


I Googled and found out that in the wiring harness, there would have 
been a jumper and all one need do, to avoid the error is to jump the pins.

Unfortunately I have not seen any tutorial which covers my specific 
machine and there indeed are many variations.

The audio and USB headers are apparently normal but there is one 16 (15) 
pin header that evidentiary is the one I need.  The on-line help I've 
found just shows the model with a 20 (19) pin header.

The manual does not give specifics.

If anyone here knows, please let me know,

Obviously this is hardly important.