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I've just installed Ubuntu 12.04 on a single board PC NANO-9452-R10 from an USB pen drive. After the installation I rebooted the PC. The purple screen with the Ubuntu logo appeared as the OS was loading and the login mask appeared. I wrote the password, hit ENTER and then... the screen went black. I tried the combination ALT + R_SYS + R E I S U B and the PC rebooted. Then again, after the login, the screen went black. This time I tried to open a terminal by hitting CTRL + ALT + T and I typed blindfold

sudo reboot

After typing the super-user password the PC rebooted.

I think that Ubuntu doesn't recognise the monitor after the login, or sets as the default monitor something that does not exist.

My question is: How can I change the monitor by typing "blind" commands on the terminal?

Thank you!

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I solved! It seems that Ubuntu was considering a non-existent Laptop monitor as primary monitor. I hit CTRL + ALT + DEL to log-out and then the screen appeared. Then a logged in once more by selecting ubuntu 2d and then I edited the display option in order to mirror the displays. –  Chaos1984 May 15 at 14:24

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