Black screen after DELL logo Vostro 3405

Yesterday I turned on my laptop vostro 3405, the DELL logo appeared and then it turned to black screen. I waited but nothing happened after that. I tried to use the BIOS but couldnt access (I used F2 and F12) the only thing that happened was that "([`4" appeared at the top of the screen and nothing more.

The operating system is Ubuntu 20.04 (I didn't install it, came with the pc preinstalled).

It was working fine untill saturday (2 days ago) without issues.