I have one Ac800 F cpu with one error related Sram in the picture is the serial report.
the CPU does not start ,
Someone can help about this matter.
How did the CPU reacted on Your last starty atempt (what did LED color indicate)? Can You access CPUs web diagnostics?
As there is a chance that CPUs memory is damaged, I wouldn't try restarting it too offen (or rather at all, if You already tried). Conntact your ABB support and send the CPU to factory for diagnostics and, most probably, repair ASAP.
Sorry for the bad news, but I still hope it helps You.