Screen problem - what's wrong?

http://s18.postimg.org/z6vbvwhwp/image.jpg

I woke up this morning and this is my screen ....

I took a screen shot using shift cmd 3 and it was totally fine - no lines so hardware issue..... Graphics card? Cost to fix?

I'll take it to apple tomorrow but was wondering what this problem is.

I tried a pram reset but no luck.

It's a MacBook Air mid 2011. It's perfect for me so I don't want to spend money on a replacement. I was hoping it would last me 2-3 more years without any expenses...

Pic is upside down for some reason

 

Thanks. I'll try to get them to take a look tomorrow. If it's more than £250 I'd rather put that towards a new air or a pro.

 

I took a screen shot via mac osx and viewed it on my iPad via Dropbox the - the image was fine ie no lines as in the photo I took with my iPad. I don't know what this means.... I hope it's just a loose wire.

I did the hardware test and it said "no problems"...

 

Took it to apple. They diagnosed a screen replacement (replaced same day!). Cost was £388! But luckily they said as they can't see any reason why it would just happen (perfect condition otherwise) they said they will cover the cost of repair, and because i had brought it direct from the Apple store

It pays to buy direct from Apple. They gave me a brand new MacBook Pro a few years ago when my MacBook Pro developed a fault outside of the warranty.... Also, I think consumer law says products should last upto 6 years if not abused, so only right.

Thank you Apple.