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My computer was working fine a few days ago but now when I turn it on it displays:

input out of range

I don’t know what the problem is and have tried unplugging and plugging all the cords but it seems not to be working. I am fairly new to computers so easy instructions please.

  • at any point in booting, do you see text on the screen? how old is this monitor? are you connecting with vga? does the monitor go to sleep immediately after posting this message? is this a secondary screen on a laptop, or is it a primary screen on a desktop? – j0h Mar 6 '15 at 15:20
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If you cannot see the screen still, press CTRL+ALT+F2 to get you to a log in prompt. Type in your username and password. Then go to /etc/X11/

cd /etc/X11

There is a chance that a video driver might have been updated and changed the xorg.conf file. Check in your /etc/X11/ folder, and see if there are any backup files to xorg.conf. It might be something named xorg.conf.backup or something similar. Check the file and usually towards the bottom it will show what your monitor resolutions are.

cat xorg.conf

or

cat xorg.conf.backup

If the backup file looks like it has information pointing toward your monitor(s), copy over replacing the xorg.conf file.

sudo cp xorg.conf.backup xorg.conf

Then reboot your system.

sudo shutdown -r now

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