I just got a new 64 GB micro sd card and installed NOOBS based off this tutorial (https://projects.raspberrypi.org/en/projects/noobs-install). I did not format it since I just bought the sd card and it had nothing previously on it. When I inserted it into my pi 4, the green light did not turn on, and there was no hdmi signal. I have prevously used a 32 GB micro sd card with NOOBS preinstalled to run Raspbian on this pi 4, but I wanted to try with this micro SD card. Why isn't this working?
Because the SD Card is formatted as exFAT. It needs to be reformatted - BUT save yourself a lot of trouble and forget NOOBS .
Install Raspbian using the Foundation installer.