So attempting to get to the bottom of this I went into the BIOS after doing a clear CMOS. Set all my settings to my preference, enabled XMP profiles and set my multiplier to 4.2 to see if I could run at that speed ( something I assumed a 3770K should not have a problem with). When I re-booted the system got to the Windows boot, blue screened and then powered off. Since then my PC will not boot. The system starts, fans and lights come on, the debug LED shows activity until it gets to code 32 where the system hangs. I believe that code is 'cpu/memory' issue. The BIOS chip is an AMI Aptio.
Since then I have stripped the machine apart completely. I suspected maybe battery issue so I replaced the CMOS battery - no help. I tried running the machine with just the CPU and memory - no help. I tried using each stick of memory in all combinations of slot with no help. I tried each stick in each slot individually. I purchased a 2nd user Pentium g630 for testing and that made no difference. It could be the memory but it seems to me unlikely that 2 sticks would fail at the same time. Of course it could be that all components have been fried

So at this point I suspect that the motherboard has a problem. Does anyone have an inkling as to what specifically might be faulty. Is there a way to flash a BIOS without needing the UEFI GUI or from an OS. This is a pretty high end board so it would be a shame to waste it, would a repair be possible?
Thanks.