Macbook Pro - screen not working

Hi all,
Please help!
I have a 2 year old macbook pro that's in great condition. It hasn't been dropped/nothings been spilled on it etc.
Suddenly, my screen has started to almost 'short out' - it goes blank so I can't see the desktop or film I'm watching and lines appear going up and down the screen. If I move the position of the screen then it sometimes starts working again perfectly. Although lately sometimes this hasn't worked either.
I'm so worried - I don't have apple care, I never even knew about it until now. Stupid me!
Does anyone have any ideas what's wrong with it or what will be involved in fixing it?
Many thanks in advance,
Lynn

Hi all, just an update fyi.
I went to the apple store genuis bar and they said it was in fact the logic board. I was really upset as I have only had the laptop for 2 years 2 months and really - honestly - look after it. They agreed and said it wasn't very good that this has happened and commented that they could see it was in amazing condition. I think this helped and they are fixing it and I can collect it in 8 days.
I did say I find it hard to trust apple products as I have no idea how to treat them to keep them good - they said there would have been a dodgy component in the board from the start. I was lucky the guy was so honest I think?
Many thanks for all your help.

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