I am trying out different distros. However, my laptop has
ATI GPU (Asus N56D) due to which many distros didn't boot successfully. After having google'd I found that I need to set
"NOMODESET" kernel parameter.
I could edit the grub command line (by pressing 'e' at the grub) but unable to boot after pressing Ctrl+X or F10. Pressing Ctrl+X merely results in adding character
'x' at the cursor position. (This happens irrespective of linux distro).
Due to this I am unable to boot with the kernel parameter.