No boot devices in boot menu

Hi all,
sorry for my bad English (I'm italian)...

I bought my laptop (Samsung NP300E5C-S08IT) with preinstalled windows 8 and I created another partition on which I installed Elementary OS (Ubuntu based distro), then from windows I used EasyBCD to modify the boot order but I accidentally deleted the entries of cd and usb boot. Now in the bios priority menu are all entries except ElementaryOS but it doesn't work. I opened the door of ram and I have shorted out the pins to reset but the boot menu hasn't changed, only the settings have been resetted. Now I can't start anything because the elementaryOS does not work. What can I do????
Stupid Uefi