AXi 760 - the problem 24 pin

I have a problem, power supplies without cables turn on, after I connect cable 24 pin power supplies doesn't start. After I turn off one of them it starts and when I change connector it also starts without problems. When I turn on all of connectors, computer doesn't react ( I hear transmitter ). After night computer starst for the first time. If I turn off, I have to wait about 10-15 min to turn on again.

LED on a power supplies lights on green. Without cable 24 pin power supplies turn on without problems after I press self test.