Motherboard is Gigabyte GA-970a-D3P. It requires an ATX 12V plug from the PSU. There are eight holes on the ATX_12V socket, arranged in a 4x2 pattern.
PSU is a Cooler Master RP-600-PCAR. This model of PSU is specifically advertised by the manufacturer as having an ATX_12V connector. However, this connector is only a 2x2-pin connector.
I'm currently having a problem where, if I press the power button, the machine comes on and the fans start spinning, but there is no display.
This problem remains unchanged if I remove the ATX_12V connector from the motherboard.
Does this necessarily mean the ATX_12V connector deosn't work? Or is it possible that something else is the problem?