Hello, so I have a Dell XPS 400, I got a Radeon RX 550 and I plugged it into the motherboard, it has no connectors. The fan on the GPU spins but nothing shows up on screen. When I put in the old GPU it boots up and works fine. The RX 550 needs 400w minimum power supply and mine is 375w, is that the problem? If I get a 500w Corsair power supply will that fix it? The GPU only connects to motherboard and gets power from it, it has no other pins connected to it. Thanks