guys, i just bought a new pcu / atx power supply to convert into a power supply for my lipo charger. my issue is it will only turn on for about 2 secounds before turning off. i have done the proper conversion of using 4 yellow wires / 4 black wires for 12 volts and done the green wire to black wire join i have also installed a 10 ohm - 10 watt sandbar resistor on a black wire to red wire [ 5 volts ] i have tried to get this working but it won,t let me. any tips ? its a 550 watt atx. HELP.