my computer have no signs of power , but my motherboard i.e. asus p8z68v have a so called power switch on board which is lit , so the problem can not be from my psu ( seasonic x660)
do you have any ideeas
excuse my english
If you push the power button on your case, and nothing happens, the motherboard connection for that switch may have come loose or been incorrectly installed. Check your motherboard manual to see which pins the switch is supposed to be on.