your friend is correct, the motherboard does tell it to turn on by creating a circuit
if you jump the green wire to one of the black wires in the atx plug (the one that connects to the mobo) and then just power it on at the wall it fools it into thinking its connected to mobo and powered on, then you can test if it works at all 
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My car: 1994 Mitsubishi 3000GT VR4 with standard removable glass top
Performance Numbers: 465awhp/482ft-lbs @ 24psi or ~550 flywheel horses.
Performance Modifications: AAM Air Intakes, AAM Fuel Rails, AEM EMS, ATR Downpipe, ATR Test Pipe, Blitz SBC-id, Blitz Power Meter, Blitz Turbo Timer, Borla Catback Exhaust, Brembo Rotors, Chrome Y-Pipe, Eibach Ground Control Coil 2.0" Drop, Fidanza Fly Wheel, Goodrich Steel Braided Brake Lines, Cusco Rear Strut Bar, Greddy boost/EGT/Fuel-Air gauges, Gutted Precats, HKS Intercoolers, HKS Intercooler Hard Pipes, HKS Hi-Flow Fuel Pump, HKS DLi Ignition, HKS Sequential BOV, Accel Wires, NGK Spark Plugs (0.033"), RPS Stage-3 Sprung 6-disks Clutch, SMC alchohol kit, T.E.C Front Strut Bar, Dynamic Racing 650R Turbochargers, 720cc injectors, Spec-800 Race Engine built by AAM with JE forged pistons/Crower forged rods.
Non-Performance Mods: 94VR4 to 98VR4 conversion, HID headlights, Konig Villains 18x9, Kumho 265X18X35, Real Leather Shift Knob Cover, Synthetic fluids. Polished by Dave Best: Manifold, HKS intercooler pipes, exhaust covers, 3000GT VR4 spark plug cover.
Powder Coated Red by Dave Best: Valve Covers
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