HP Pavilion a6217c won't turn on after accidentally pulling plug

Last night in a sleepy stupor I unplugged my Hp pavilion without shutting it down usually no problem right? This morning I tried starting it up and got a flashing green light on the back of psu. It doesn't go away until after about 2 minutes of it being unplugged. If I plug in the PSU without the mobo cord plugged in the light is a steady light like everything is working. Someone told me to take an eletrical wire and put on end into a black psu wire and the other into the green mobo connector wire.(terminated wire into terminator) Does anyone have any other advice it's really my friends computer and I was wondering if there's a fix or do I have to shell out for a new psu.
 
Of course, the fix would depend on what is actually wrong the PC. It could be the power supply but my money is on a fried motherboard.
 
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