So strangely, also with an MSI motherboard, i'm having the exact same issue, boots fine no errors or issues from complete power off, but i cannot reboot else i get the exact same black screen. Even going into the bios and making no changes doesnt fix it, i have to completely power off the system for it to boot again. Any ideas? (this is with a legacy usb (i think) that is just unpacking the files yourself and using the .bat to make it bootable right) first time unraid user here.