@Tom - I have the same exact machine. I tried each of your steps in order, and I still get only a black screen boot with a few PCIe Bus Errors. Did you perform a fresh install from scratch or was this coming from an upgraded OS? Does that even matter???
@Tom - I have the same exact machine. I tried each of your steps in order, and I still get only a black screen boot with a few PCIe Bus Errors. Did you perform a fresh install from scratch or was this coming from an upgraded OS? Does that even matter???