Issue with a In Shin Power Supply

I took out the internal components of my boys computer it is the MSI Motherboard part # 2516512 it had a 90 watt power supply. The power supply quit working so I bought a case with a 350-Watt power supply the front panel has 16 pins on the motherboard, but the new power supply has more connectors than the motherboard has. Ive been trying to find a manual via the internet, but was unsuccessful. I know where the #1 pin is not sure the order of the pins I have the pin descriptions from the Gateway Website it's a Christmas present for my boys and I need some assistance