Kali was working and now it wont boot

Hi all, Im new to the forum and to kali. I successfully installed kali alongside windows 8 on my laptop and have been using it for about a week. Today, I logged into windows and changed the computer name and workgroup and also installed itunes to test some things. No other changed were made. Now when I boot and load either Kali or Recovery mode, it starts to load and then shows a black screen, no cursor or anything and my keyboard is unresponsive.

I haven't made any changes in kali or anything and am quite perplexed as to why this is happenening. I even changed the computer name and network back to what it was in windows although I don't think this could've caused the problem.

Any advice at this point would be very very helpfull. Feeling annoyed right now, please help if you can.