Hello again - I do find I have got so much more knowledge after things go wrong = you can fix and you then can help others with same problems.
New hard drive from PC World ( sorry to mention PC!) was chdeap and actually was the identical drive that was in the iMac previously.
Great thing was that because I had used a back up drive and done TIME MACHINE I was able to just put back all my Applications on new drive so no problem trying to re find and re install.
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