So after extensive testing - each ram stick is OK according to the windows ram diagnostic; I have set everything in the bios to ram manufacturers settings (voltage, timing) and i'm still stuck. Oddly enough, it will fire up fine with ONE ram stick in - seemingly in any slot but ONLY if it was not previously in that slot. So if put it into slot 1, it will boot up fine. If I shut down, then it will not boot up again. If i move that stick to slot, boot up...and so on. Certainly the board is hosed?
Also once, got stuck into a reboot loop with a stick in the first slot. (it would never boot up, just power up and try to reboot on it's own constantly maybe after about 10 secs)