If you are still stuck, search for "HP Compaq SG3-350UK Service Manual" – that document contains the official OEM schematic for the Foxconn N15235.
Find the block of metal pins at the bottom right of the Foxconn N15235. It is usually black or blue. Look for the label printed directly on the PCB. Foxconn N15235 Front Panel Connectors - Google
Connect to the top-left pins. This is directional; the positive ( ) lead must match the positive pin on the board. If you are still stuck, search for "HP
wire. On the motherboard, the positive pin is usually labeled or colored differently. Look for the label printed directly on the PCB
The motherboard POSTed with a single, glorious beep. The screen lit up with the Foxconn logo—a silver fox leaping over a circuit-traced globe.
Because the Foxconn N15235 is an OEM board, official manuals are buried behind HP paywalls. If the above diagrams don't match your revision, learn this 5-minute hack using a .