My MacBook pro is freezing...

Hello everyone,

I am asking for your help about my Macbook problems.

2 days ago I was working with iMovie. I was about to finish editing. At that time I needed to add a video again but when I was adding it my macbook stopped working. And I discovered that my computer is too hot. But I finished editing video without editing that video. When I was importing video I directly imported it on Youtube. Because my computer got hanged.

Now I can use internet here with wifi. But I cant open any documents. 'Finder' option is not working. Desktop is not showing any documents...

Please help me friends...