Gary Stainburn wrote on 12/12/2016 11:50:
My priblem is that twice now it has turned itself off, the last time being at 7:40am today. There is nothing I can find in the logs prior to it going off, just the normal start-up entries when it's turned back on.
If the PC turns off and stays off it could be a power supply issue
If you cannot put the old disk back, try to use another power connector for the hard disk