I was doing a lot of system installs such as GL, cmake etc. I finished installing and I am unable to reboot Ubuntu 14.04 LTS. I ran the hardware diagnostics and no errors were found. It starts and you see the violet screen and it just hangs. I did try to access the GRUB menu by pushing the shift button but it does not seem to appear. Instead it goes straight to hardware diagnostics. I have a Dell Vostro 3800 desktop and no Windows is installed on this machine. It is a pure Linux desktop.
I saw this boot repair software - https://sourceforge.net/p/boot-repair/home/Home/
Do I need to write this to a CD and then try to boot from CD ROM drive ?