I have an 81c running 3.0. Monday I came in to work and found core 0 dead due to the CE PWR supply having gone out. I replaced the CE PWR supply and the shelf came back up, but the core didnt. It says I have a single core when I stat cpu in LD 135. The SYS Utility light is red too. I have replaced the cpu, sys utility and cni cards and still the same result. INI or pwr off and on didn't work either. Could this mean my MMDU is bad? Please help.