I just had a problem where my new Fedora 35 Live ISO download was crashing as a Virtualbox VM. This was the initial boot so I could install the OS. It would start to boot and load the GUI but all I'd see was a black screen or a Centos Live User login prompt.
The solution that worked for me was as simple as to change the RAM I had given the VM from 1024MB to 2048MB :D
