I am running an Intel x64 machine using UEFI to boot an SSD. Installing the latest yum update which includes grub2 and kernel 4.18.0-193.14.2.el8_2.x86_64 renders the machine unbootable, blank screen where grub should be, no error messages, just hangs. After some hours I managed to modify another bootable partition (containing older software) and boot it from there. After that, I found out it is a known problem. The main point of this message is to make people aware of the problem and suggest admins don't run 'yum update' until they understand the problem and have a fix at hand. See 'UEFI boot blank screen post update' for a solution and directions to the redhat article. Regards Alan