Finding a specific schematic for the Foxconn N15235 motherboard can be tricky because "N15235" is actually a certification number (marking compliance with Australian standards) rather than a specific model number. This number appears on many different Foxconn boards from the mid-to-late 2000s, including popular models like the P4M800P7MB
Measure +5VSB on the 24-pin ATX (pin 9 – purple wire). If 0V, PSU is bad. If present, move to board. foxconn n15235 motherboard schematic