hello @mami I see that you are a new user. can you while booted into the garuda installed on your ssd (the one that blackscreens) change to tty2? You can do that by pressing
ctrl+alt+F2
This should work even for crashed systems like yours. If it doesn’t then you are in a more serious predicament because that would severly limit the ability to debug your issue.
If you can see the tty2 it would prompt you to enter your username and then password (which won’t be visible while typing) and then give you a shell to execute commands. Try to follow the guide attached here if you can do all that.
Some things you might wanna know. You can connect to your wifi via using the command
nmtui
which you might wanna do to follow along with the article below and also from that terminal run this command
garuda-inxi | nc termbin.com 9999
it will output a link please post that here it will give us a little more insight about what might be happeing in your system