I have a b550 tomahawk and when I plug in my sabrent rocket nvme 4.0 and turn on the computer it goes in a black screen with a white _ in the top left corner, do someone know how to solve this problem?
can you press delete to boot into BIOS, and check if it's connected in BIOS EZ mode\Storage tab?
have you installed an operating system on the disk before?
remove any unnecessary USB devices except for keyboard, mouse.
and please update to the latest BIOS https://download.msi.com/bos_exe/mb/7C91vAB.zip
This only happens when the Sabrent Rocket is installed? Without it, everything works normally?
Yes, update the BIOS. In general, the Sabrent Rocket SSDs seem to cause problems sometimes, see here and here. But let's not get ahead of ourselves and do some troubleshooting first, starting with the BIOS update. By the way, i like to link the support site instead of the BIOS file, so he knows where to get potential future updates: https://www.msi.com/Motherboard/MAG-B550-TOMAHAWK/support (Give a man a fish, and you feed him for a day. Teach a man to fish, and you feed him for a lifetime. )