I have a good Dell computer but I was using an MSI 1060 GPU 3 gig, and it was messing up my computer. The HDMI port on the card didn't work either. So I just bought a brand new AMD RX780. I figured I would first use DDU to uninstall the MSI card completely, but now, even without the new card in the computer, it doesn't work. When I start it up, the on button flashes yellow/orange and there is a succession of four beeps. I installed DDU using the safe mode, but now nothing works any more, card or no card. HELP!