Why do i have a vertical blue line down my new iMac?

I bought a new 27" imac yesterday and when i booted it up for the first time i noticed a light blue vertical line about 1/3 of the way in from the left. It fades out towards the top of the screen. I have seen other forums that say to reset the PRAM/NVRAM and i have tried but it did not help. I'm just wondering whether i will need to take it back to the store or an apple store to get it fixed or if there is a simple fix i can do at home?
Thanks in advance

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