Fyi, there is currently an ongoing bug with steam overlay causing full computer crashes. If you have a 4070 or a 3090 and activate steam overlay mid-game (particularly if you send msgs trough steam comms), your entire PC will crash and black screen.
The current thread discussing this can be found here: Getting whole PC freeze and black screen if using Steam overlay while preparation for a match :: Counter-Strike 2 General Discussions
It has happened to me at least twice now, and multiple users have reported it.
Current recommendations is that if you have one of those cards to disable or not use the steam overlay.