I just built my pc from scratch done nothing else, wasn't sure to expect something at first, but then I read that something should come up on my monitor to show everything is working fine, but my monitor just says 'hdmi no signal', I'm stuck at this point really struggling on what to do, just spent 6 hours on this and really don't know how to solve this last step, I've already taken off the gpu and put it back on and I don't know what else to do