New
#11
Thanks everyone for your time and help/suggestions.
Well it happened again - start up "no bootable source found" - or words to that effect.
I was very fortunate to have an old laptop (no longer in use.) This has a Samsung evo 850. So with no expense, I have been able to fit this in place of the Kingston ssd.
The difference in speed has been very evident.
I must now wait and see if the disk holds its data over the next days/weeks.