My friend is having a problem and asked me to post this here, this is what he told me: He has to turn the power switch in the back of his computer off then on in order to give power to his computer. However, when his computer actually turns on, the LED lights in the front flash and turn off. He has tried to re-seat everything. He thinks it might be his power-supply, but would like some advice before he buys anything new. Thanks.