I have a problem with my brother's pc. we had a power cut and when the he started the pc nothing happened the power button just blinks yellow. it seems like PSU won't start, but indicator on the mobo is lighting up when I connect the power, but that's it is it the PSU or mobo that the problem? is there any way of cheking the PSU? I read somewhere that if connect the green and grey wire the fan on the PSU will start. I appriciat all help.