HELP! Vertical Lines and Can't Use Half of My Screen. What is Wrong???

Ok, this is really frustrating. Please read first.
I did not spill anything or drop my MacBook. A week ago, it was fine. And then I picked it up and opened it to check something, and my screen was SCREWED. Nearly half of the screen is filled with colorful, vertical lines. Between the lines is filled in with white. I can't see anything underneath and makes it so difficult to use my MacBook.

I don't know what is wrong. I called some places and some say it might be the video card, while a few say it may be the screen. I'm thinking of going to Best Buy since it's closer just to see what is up.
I purchased my MacBook in 09 and never had a problem. The warranty is gone. If it is internal, there is no way I'm paying/can afford $700+ and I'll have to downgrade for a PC I just don't understand what went wrong... can anyone help me save my Mac?? Does it sound internal or a screen issue?

I also took a pic with my phone of my Mac when it's on screensaver mode if that helps...


Help please? Thanks in advance!!