I am having an issue with Elementary 5.1.6 after install.
It seems similar to Install issue (black screen after grub splash) with elementaryos-5.1-stable.20200706 ISO but not quite the same.
I've downloaded the latest ISO (elementaryos-5.1-stable.20200706.iso), checked it against the hash (and aso re-downloaded), wrote it to a memory stick, and am able to successfully install.
I get the prompt to remove the media and hit the enter key.
After the reboot, I get a black screen. (This has been tried multiple times)
I've left it for about 30 minutes on one attempt and nothing changed.
On all attempts, when I press the power button, I get the Elementary OS logo appear for a second, then the machine powers off.
I've used the same ISO on a Boxes VM under Fedora 32 (running on the same machine) and I can boot into the guest Elementary OS so the ISO must be fine.
Other Ubuntu based OS's (Ubuntu 20.04/Pop OS 20.04/etc) install and run successfully on this machine.
Machine hardware is as follows: i7 processor 32GB RAM 512GB SSD
EDIT: What I forgot to mention is, these OS installs are all clean and standalone (no dual booting the various OS's mentioned)