The display on the FDX2000 Processor is showing "ETH:ovf" and the "NET" LED is flashing in red.
"ovf" = overflow. Most likely there are more then four network sources present. Just a solid red "NET" LED without the overflow-indication in the display is an indicator for a network connection issue. (Check cables, connectors, network settings and sources.)
Make sure there are no more than four network sources present for the universe that is being used to control this FDX2000 processor.