Turn on the control power while continuing to hold the keys until the menu appears on the screen. Diagnostic Actions inside the Boot Menu
What do the on the main yellow unit show?
Operating system files or critical parameter files have become corrupted due to power surges, improper shutdowns, or memory degradation. fanuc starting system software please wait
This piece explains what the system is doing during this phase, why delays happen, and how to diagnose them.
A physical failure on the main board, the FROM/SRAM module, or the DIMM memory module prevents data transfer. Turn on the control power while continuing to
on the 7-segment display on the main board while it's stuck?
Disconnect any memory cards (PCM-CIA or SD cards) from the front slots. Disconnect USB drives from the operator panel. Unplug Ethernet or serial RS-232C communication cables. This piece explains what the system is doing
If you have entered the Boot System menu and discovered a or if the screen remains black even after trying to reach the boot menu, you likely have a hardware failure. At this point, attempting to "initialize" the memory without a backup will result in the loss of all machine parameters, which can take days to manually re-enter.