OK.
I will try the A-data RAM (was just about to send it back!)
The info relating to this power supply I posted above, ie:
3.3v/16A, 5v 20A, 12v/10A
16 amps on the 3.3 RAIL etc.
.......I have tried the A-data RAM on its own and still no joy I'm afraid.
Crucial technology RAM does not appear to be on the list that you have linked?
I am going to swap out the RAM for two matching sets. I have another supplier that does crucial technology.
Thanks again for your time.