Let me explain the situation:
I had windows 7 installed on my laptop and I tried to install Ubuntu 13.10 on it(I completely erased the hard drive). After that my laptop can't access the bios or boot from cd/dvd!. when I press Enter or the right arrow key it boots Ubuntu 13.10 but after the splash screen I just get a black screen with a blinking cursor.
When I press F11 it boots to
efi shell but I don't know what to do.
For those with the same problem press F11 when booting, when you get into the
efishell you need to enter in the cd directory and boots from there