Motherboard clearly had a dodgy ON/OFF switch.
Removed it and replaced it with one from a C64.
On power up I had a blank screen.
Did a few quick checks with the scope and all data/address lines were pulsing properly.
Checked the voltages with a multimeter, the 5v was present but the 9VAC was not. Traced this right the way back to the switch I had fitted.
When I soldered the new switch in, one of the legs musnt have made a connection as they were a little shorter than the original. I resoldered the legs on top of the motherboard as well as the underside and it now boots up.
One of the CIA chips was missing, fitted a new one and C64 mode now works too.