It sounds to me also like there is something wrong with your display configuration. It may be a wrong resolution for your monitor or something like that. A <control-alt-backspace> will restart the X-Windows system without rebooting your computer. That won’t fix anything. But I believe that <control-alt-+> would rotate through the resolution settings. I would try that. From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of Nico Kadel-Garcia Sent: Sunday, January 28, 2018 6:29 PM To: Wirtti Pereira <[log in to unmask]> Cc: [log in to unmask] Subject: Re: Boot hang after [ OK ] Mounted Arbitrary Executable File Formats File System ** EXTERNAL ** On Sun, Jan 28, 2018 at 7:12 PM, Wirtti Pereira <[log in to unmask]<mailto:[log in to unmask]>> wrote: Hi, thanks a lot for your help, I do appreciate it 😊 I'll try to answer your questions, I am not that skilled on linux. About version, see the output: [rafael@fermi ~]$ cat /etc/*release NAME="Scientific Linux" VERSION="7.4 (Nitrogen)" ID="rhel" ID_LIKE="scientific centos fedora" VERSION_ID="7.4" PRETTY_NAME="Scientific Linux 7.4 (Nitrogen)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:scientificlinux:scientificlinux:7.4:GA" HOME_URL="http://www.scientificlinux.org//[scientificlinux.org]<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.scientificlinux.org__&d=DwMFaQ&c=J-N4xUQ7Pu4HLlwo2BifHA&r=7-NQstA5IqogNkXFIxVbHg&m=D5h6J21Uux1rX3g2Rh9opJGqFGYiACY-DfvQQh_TQ8M&s=qgXyaEKd-OxONYw4u3tLzjJrp92jtmUf95gi8eXghKU&e=>" BUG_REPORT_URL="mailto:[log in to unmask]<mailto:[log in to unmask]>" REDHAT_BUGZILLA_PRODUCT="Scientific Linux 7" REDHAT_BUGZILLA_PRODUCT_VERSION=7.4 REDHAT_SUPPORT_PRODUCT="Scientific Linux" REDHAT_SUPPORT_PRODUCT_VERSION="7.4" Scientific Linux release 7.4 (Nitrogen) Scientific Linux release 7.4 (Nitrogen) Scientific Linux release 7.4 (Nitrogen) Well, I didn't know anything about epel or dkms. When trying to install Nvidiz by Yum, there were dependencies. then I look for dkms. The Dell site recommended to install epel in advance. Thus there were a chain of packs I supposedly had to install in advance. So I did $yum install epel, next I've downloaded the dkms rpm and installed via yum as well. Next I've installed Nvidia drivers by $yum install *nvidia* So you're running Scientific Linux 7. Cool, that's what I was guessing. Wait a moment here. Did you do something like htis: * yum install epel-release * yum install dkms Or did you get that RPM for dkms from somewhere else than EPEL? Please, be aware that installing RPM's from random other repositories can be... well, a source of confusion. Then I've accessed a Nvidia visual app installed but did nothing there. I've assumed the board was not visible yet by the system and then I've decided to reboot and try to load the drivers. What happens next you already know, the boot has freezed and I've tried to boot over again and again ever since. Although freeze in the middle, when I hit <ctrl> <alt> F2 I can go to a shell and log in. Then I can do a lot, including run Gromacs or access this PC from my mac through ssh. Once I can log in in the shell can I fix the system from there? You've said I could recover the system booting from USB but I don't know how to do it. Should I have the Scientific Linux in a stick? Thanks, Rafael Umm. Maybe. You have a working shell hitting Ctrl-Alt-F2? Then it's just X that is dead, not the operating system. *Good*. Repairing X should be easier than fixing the boot system. *** This email is from an EXTERNAL sender *** Use caution before responding. DO NOT open attachments or click links from unknown senders or unexpected email. If this email appears to be sent from a Platte River Power Authority employee or department, verify its authenticity before acting or responding. Contact the IT Help Desk with any questions.