Screen has got white lines on

My Mac screen has suddenly got coloured vertical line on half of the screen and the first few that appeared last week now has gone completely white and that part of the screen just wont work, what can i do or can it be repaired?

This could be repaired but will be costly when compared to how much your machine is worth. At this point it may be better to cut your loses and sell it on ebay as parts. You could get 100-200 depending on the model and hardware.
Bottom line though it could be the LCD going bad but most likely its the GPU and sadly it is not a separate piece. It is integrated into the logic board. The machine could also have a common symptom of bad capacitors that could be affecting the video side of things.

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    ~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~
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