If the power supply is failing, the CPU may power up enough to display a message but not enough to read the memory.
FANUC controls rely on a lithium battery to maintain the SRAM (which holds your parameters, programs, and tool offsets) while the power is off. If this battery dies and the machine stays off for an extended period, the SRAM can scramble. Upon reboot, the system struggles to reconcile the corrupted data, causing a hang. 3. Faulty Hardware (Mainboard or Modules) fanuc starting system software please wait
If the machine boots normally, you lost your programs but saved your parameters. Reload from backup. If the power supply is failing, the CPU
Reseating the SRAM or DRAM chips can sometimes clear temporary contact issues, though removing them may wipe unsaved data. Attempt a Controlled Start Turn off the controller. Upon reboot, the system struggles to reconcile the