so my buddy just upgraded his computer, new gpu, new ram and a new psu, psu worked but he got continuous post code beeps and no actual post but power was being supplied to the system, his grandpa told him to reset his bios so he did and now nothing works, he gets a splash screen but after it goes through the post code he gets a black screen, he has a gigabyte board unknown model, and he get a 4 beep post code error. any suggestions?