Looking at page 85 in you're user manual. The 15 pin jumper block. Starting at Pin 1 (Hard drive LED) is positive + & pin 3 is ground -. Next, Power LED, Pin 2 is + & pin 4 is ground - .
Letter C, is for the reset switch, Pin 5 is + & pin 7 is - .
Power on/off switch, pin 6 is + & pin 8 is - .
The letter I is used for the internal speaker. The positive pin number 16 & ground pin number 10, letter G. If you need the manual you can download it from this link.
ftp://download.intel.com/support/motherboards/desktop/D815EEA2/EA2FV_English.pdf
Included below is a small pic.
Good Luck!
Have more questions? Please feel free to ask.
Mike
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