I have someone who asked me to look at a machine that won't turn on. I opened the case and the motherboard light is on yet nothing happens when the power button is pressed. I mean nothing happens, no fans, no lights, nothing. I have taken the power supply out and put in a know good psu with the same result; nothing happens. I was told that the owner of the machine was gone over the weekend and when they came back they weren't able to turn it on. So I am unable to find out if weather might have been a factor. If anyone has an idea that would be great.