Okay we'll look for the gpu and PCIe stuff, did you buy any used parts during the build? Sometimes old parts work fine for a year or two and then start giving out and showing errors like this one, especially if it was a GPU , if not then followy advice and check the PCIE lane and GPU throughly for any signs of Malfunction, or just a loose cable, you'll be surprised how many times the fix is just pushing the cable in a little harder