Foxconn N15235 Front Panel Connectors Google Verified -

Cause: You connected front panel wires to JFP1 by mistake.
Fix: USB headers are separate 9-pin rectangular blocks labeled F_USB1 or F_AUDIO.

If you want to be 100% sure without relying on Google: foxconn n15235 front panel connectors google verified

Connect the POWER SW cable to Pins 6 and 8. This is the only mandatory connection to turn the PC on. It does not matter which side is ground. Cause: You connected front panel wires to JFP1 by mistake

A: No — the power and reset switches are non-polarised. Reversing them simply completes the circuit identically. Connect the POWER SW cable to Pins 6 and 8