Could you please do this, boot the PC and in Grub (The menu where you pick what OS to boot), select the topmost line and press e, then scroll down using the arrow keys down to a line that starts with linux for example
and remove everything past ro, like this
linux /boot/vmlinuz-3.7.0-7-generic root=UUID=c4db4ecf-5983-4e04-a2ce-ef49ca20fdda ro quiet splash vt.handoff=7
After you are done, press Ctrl+X. You will see a lot of text scroll by, when you see that it is "stuck" for a while (Longer than 30 seconds), take a picture of the whole text using a camera or preferably type up what you see about 5-10 lines from the bottom.
linux /boot/vmlinuz-3.7.0-7-generic root=UUID=c4db4ecf-5983-4e04-a2ce-ef49ca20fdda ro