Hoping someone can assist with a cold-boot - restart-loop issue.

I am running bios F7p as under

Advanced CPU Features:
CPU Clock Ratio ................................ [20]
Intel(R) Turbo Boost Tech ...................... [disabled]
CPU Cores Enabled .............................. [All]
CPU Multi Threading .............................[enabled]
CPU Enhanced Halt (C1E) ........................ [enabled]
C3/C6/C7 State Support ......................... [disabled]
CPU Thermal Monitor ............................ [enabled]
CPU EIST Function .............................. [enabled]
Virtualization Technology ...................... [enabled]
Bi-Directional PROCHOT ......................... [enabled]

Uncore & QPI Features:
QPI Link Speed ..............................[7.2Ghz]
Uncore Frequency ............................[3200]
Isonchronous Frequency ......................[Couldn’t find this]

Standard Clock Control:
Base Clock (BCLK) Control .......................... [enabled]
BCLK Frequency (MHz) ................................[200]
PCI Express Frequency (MHz) ........................ [105]
C.I.A.2........................................... .. [Couldn’t find this]

Advanced Clock Control:
CPU Clock Drive ..............................[700mV]
PCI Express Clock Drive ................... [700mV]
CPU Clock Skew ............................. [0ps]
IOH Clock Skew ............................. [0ps]

Advanced DRAM Features:
Performance Enhance ...................... [Extreme]
Extreme Memory Profile (X.M.P) ........... [disabled]
System Memory Multiplier (SPD) ........... [8]
DRAM Timing Selectable (SPD) ............. [Quick]

Channel A + B + C

Channel A Timing Settings:
##Channel A Standard Timing Control##
CAS Latency Time ......................[8]
tRCD ..................................[8]
tRP ...................................[8]
tRAS ..................................[24]
CR.....................................[1]
B2B.....................................[Auto]


Advanced Voltage Control:
CPU Intel Core i7 920 D0 Stepping
Load Line Calibration ................. [Level2]
CPU Vcore ..............................[1.31875]
QPI/VTT Voltage 1.150v .................[1.315]
CPU PLL 1.800v .........................[1.8]
PCIE 1.500v ...........................[1.54]
QPI PLL 1.100v ........................[1.14]
IOH Core 1.100v .......................[1.14]
ICH I/O 1.500v ........................[1.5]
ICH Core 1.1v .........................[1.14]

DRAM
DRAM Voltage 1.500v .............. [1.64]
DRAM Termination 0.750v.......... [Normal]
Ch-A Data VRef. 0.750v ...........[Normal]
Ch-B Data VRef. 0.750v ...........[Normal]
Ch-C Data VRef. 0.750v ...........[Normal]
Ch-A Address VRef. 0.750v ........[Normal]
Ch-B Address VRef. 0.750v ........[Normal]
Ch-C Address VRef. 0.750v ........[Normal]

In short... 1st boot each morning, the PC starts up for around 3 seconds then restarts, and loops this forever. It is on a UPS, but I don't think that should matter, and according to OCCT and BIOS, all the voltages from the PSU appear to be normal i.e. ever so slightly above the 12/5/3.3v

This is the 2nd 930 I've run in the same hardware setup, and both chips will prime happily overnight at as low as 1.248vcore. I've bumped it up to see if it makes a difference, but it hasn't (other than hotting up the proc.

TIA.