Foxconn | N15235 Front Panel Connectors - Google

Since you don't have a plastic shroud (those usually came glued to the case wiring, not the board), you’ll need to push the individual 2-pin connectors onto the correct pins.

Look at the very bottom right corner of your motherboard. You are looking for a block of 9 pins arranged in two rows (Row of 5, Row of 4). The 10th pin is missing to prevent you from plugging it in upside down.

Here is the exact layout:

[TOP ROW - Pins 1 to 5]
+---+---+---+---+---+
|   |   |   |   |   |
|PLED|PLED|PWR|PWR|   (Empty/NC)
| + | - | SW| SW| 5
+---+---+---+---+---+
[BOTTOM ROW - Pins 6 to 9]
+---+---+---+---+
|   |   |   |   |
|HDD|HDD|RES|RES|
|LED+|LED-|SW |SW |
+---+---+---+---+

On the board (usually near the bottom edge, close to the PCI slots), you’ll find a rectangular block of 16 pins in two rows of 8. The pinout is not documented in a typical user manual. Through hours of community forum digging and multimeter testing, here is the verified pinout (looking at the board with the PCI slots to your left):

Top Row (Pins 1-8, left to right):

Bottom Row (Pins 9-16, left to right): 9. Ground 10. Ground 11. Speaker (+) 12. Speaker (-) 13. Reset Button (+) 14. Reset Button (-) 15. Key / No pin (sometimes missing) 16. Ground