Display problems with new Retina 5k iMac

Hello
I have just bought and started for the first time my iMac retina 5k. Initially the monitor looked great and i was really impressed.
I have just come back after stepping away for a few minutes and the monitor display seems stretched or skewed horizontally. This is happening on the home screen, webpages and even photos.
I don't believe i changed anything to have this effect and now whatever I do in the displays set up in system preferences it remains unchanged.
Can someone advise me please

Since it's a new machine, contact Apple's Support and let them deal with the issue. BTW, you can return it the first 14 days with no questions asked.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10.1), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

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