IMac screen colour, how to show tints and shades that won't appear

iMac screen colour, how do I show tints and shades that won't appear on screen
I have a 2 month old imac, with a great screen. But for some reason I cant  se light shades of colour like 5% of a tint.
yet on older macs, and a 2 year old imac, i can see them prefectly.
Some designs have light panels with 5% colours, some a precent of a colour.
Can anyone suggest a way to calibrate the screen, or set the screen to show all the colours n tints used as accuratley as possible.
Advice much appreciated

The fdisk output shows that it is a single GPT disk. Has any disk manipulation been done, like resizing or repartitioning.
Your GPT looks correct. If you create a Hybrid MBR via gdisk and include partitions 2,3 and 4 and make 4 bootable, does Windows partition show up in Startup and as a separate volume in Finder?
Please see https://discussions.apple.com/thread/5641066 for Hybrid MBR creation.

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