After installing Ubuntu Server 14.04.2 LTS without any errors I tried to boot into my PC and then I just got to a blank screen with a blinking underscore. There was no input except for CTRL + ALT + DEL which restarted the computer (as far as I have tested).
My mother board is ASUS - P9X79 WS.
I have a NVIDIA Graphics card (Don't remember the product name, but I've read that NVIDIA or AMD Graphic cards can cause the black screen problem)
I am not using any dual boot.
I have tried tampering around with the boot settings quite a lot, CMS, Secure boot, AHCI, etc.
I can get everything to work and boot into the system if I enter BIOS and boot into Generic Flash Drive (without UEFI) the monitor goes into standby for like 5 seconds then goes on and just shows a black screen for another 5 seconds and then I am presented with the login screen for Ubuntu Server. (I never saw any sign of GRUB or some sort of start up output).
The flash disk I used was the installation disk, but I don't really know if it would matter if I would use a random disk and boot from it because there seems to be no sign of any kind of interface.
I really don't understand how this worked but it did, but it isn't a long term solution because I can't restart the server remotely, and I need to enter bios and selecting Generic Flash Drive each time. (Changing the boot order did not work).
If I boot into the USB Disk with UEFI I get to the Ubuntu Server installation/recovery menu.