So I have a 1.5 year old R7 1700 build with a b350 tomahawk and decided to switch from a 1080ti to a Radeon VII. All was well, so well in fact I got a second Radeon VII to hook into my build. I plugged it in and my system would not post and stays stuck with the VGA motherboard light lit up. I took out my 1st card to test the 2nd one and it works like a champ. I inserted the 1st card into the secondary slot and VGA light. I tried each card in the secondary slot and VGA light. Does this mean my motherboard has a toasted secondary port? What else can I try? Oh my power supply is 750W, I know that's probably not enough but I should at least get to the BIOS screen, no?