Hi, I'm going mad trying to get my PC working had so many problems but am finally stuck. I have a new motherboard a Gigabyte Z270MX Gaming 5 and I'm trying to connect my GTX 970 graphics card to it. However any time i connect it and reseat it and double check the PCI cables are in place it wont boot up with the rest of the computer. The fains remain still while the rest of the pc goes through POST and finishes at the desktop. I'm starting to think it may be a power supply issue however everything else is being powered perfectly well. I have also tried with multiple different GPU's that I know work on other computers but none of them seem to be working. Would really apprecciate some help thanks.