Sorted the graphics/display problem. I had never seen this before - the display showed everything normally but over a background of columns- similar to say the page of abroad sheet newspaper, with the 'text' being lines of !!!!!!! or what appeared to be exclamation marks. The cable is an HDMI there for sturdy- but took it out both end and replaced it non the less and gave the graphics card a good rattling.. This card is in a Purple socket - what sort is that?
What ever it was- a rattle a dusting or a cable remove /replace- it's all OK now.
Oh no it is not - Its back as described above -so What ever I did - to cable/connector/Graphics in slot was only temporary. It would be easy to say Card failing and perhaps it is - but any other ideas?