I've just installed Kali Linux 2016.1. The installation was successful at first, the Grub worked normally.
But after that, quite often, when I boot I can't see the Grub screen, after a few seconds, I automatically enter the login screen of Linux, but half of the screen was static and become grayer and grayer, when I enter the root user and password, it's still login, but the screen now was fuzzing up and becomes grayer and grayer and I can't do anything with this.
I can't even access the BIOS (the words "Press ESC to enter BIOS", which normally appear when I start computer doesn't show up).
Sometimes I can enter Grub normally, but when I use Kali Linux, sometimes, a black screen appears in a second and then it returns to the normal screen.
I tried to search, but doesn't find any suitable solution.
I'm using HP Elitebook 8460.