I am helping my cousin with his PC. He had a GTX 1060 that he got from eBay that started to die shortly after he got it so he just got a RX580 to replace it. I tried to delete the NVIDIA drivers for him over Microsoft quick assist because he lives a couple hours away. I did not use DDU initially and ever since then when he turns his PC on, it displays the splash screen on both monitors simultaneously and also when he clicks from one monitor to the other they flash for a second or so. Ive tried to use DDU since then and i completely, or at least made the attempt to, remove both AMD and NVIDIA drivers but the issues still persist.