Read the statement by Michael Teeuw here.
UNSOLVED Pi 4 won't run
Hi I have a pi 4 2g and I’ve been tryi g for days to get mm installed. I’ve tried both the one line install and manually. No matter what it will load up for about a min after setting pm2 up then black screen. And can never get it back. For reference I’ve installed mm many many times and have had one for well over a year. Is there something I’m missing to do with the 4?
@darbos have you tried shift + cntrl + i? Select the consol tab and scroll up and see if there are any errors. They are usually in red text.