Hi, After a long journey I managed to get my upgraded MacPro 4,1 to 5,1 to run Windows 10 and Mojave 10.14.4. which are installed on partitions on the same SSD, so I'm trying to dual boot. With the RX590 there is no bootscreen, but the mac will boot into Mojave. Now the thing is I've messed up bootcamp somehow, so I can't select to boot Windows in the startup disk settings. That's why I put my old mac-compatible NVIDIA Quadro 4000 back in as well, to get the boot screen. It gets power via SATA to 6pin from one of the disk drive SATA cables. Like this I can select to boot into win10 and it works fine. But if I select to boot into Mojave, it gets stuck at the progress bar, most the time around half full or 3/4 full. Mojave will boot even with just the Quadro 4000 in, but there are graphic glitches. Has anyone had this problem before? I've tried a lot of things before, switching PCIe slots, reseting SMC or PR RAM, disk repair and so on. It actually boots successfully in safe mode, but there are graphic glitches as well. I can't think of a solution other than deleting everything and clean install again from scratch, so hopefully selecting Windows as a startup drive will work again. Any suggestions are most appreciated!