Thanks for all the replies. I stripped my computer cleaned all the dust from memory slots, cpu slot etc. I bought one new kingston memory (I lost patience, I have been testing for a week) replaced the suspect and now my computer passes the memory tests will all 4 DIMMs in all 4 memory slots, 8Gigs of ram, slots 1,2 dual channel, slots 3,4 dual channel mode.
Interestingly the memory stick I replaced does work on its own but not with the other ones. Maybe the cleaning also helped.
Thanks for all your help