Thank you both for your quick replies, most appreciated.
bc, I have an onboard graphics card (I think but I will check) did away with all those cables long ago. The problem was rather sudden and I tend to feel it is the monitor too. And yes, I have checked the warranty and it is well within the warranty period.
Mac, no extension cables. But a good point if so I agree.
No colour is vibrant anymore, and white is dull. I still have a good range of colour and contrast adjustment left but it makes no dofference. The ghosting and shadows on everything on screen is a pain!
Thanks.