Fanuc Starting System Software Please Wait -

If you tell me the controller model (exact FANUC series) and any additional boot messages or alarm numbers shown, I can give model-specific recovery steps.

What is the exact model number? (e.g., 0i-MD, 18i-TB, 31i-B)

Unlike a "System Halt" or a blank screen, this specific message suggests that the processor is still running. The software isn't crashed; it is waiting indefinitely for a resource, a hardware response, or a data validation step that never completes. fanuc starting system software please wait

Does the screen allow you to enter the using the softkeys? Share public link

Remove any , CompactFlash adapters, or USB drives from the front display panel. Disconnect external RS-232C serial communication cables. If you tell me the controller model (exact

: Keep your system's software and firmware up to date to benefit from the latest features and fixes.

This article provides a deep dive into the FANUC startup sequence, the root causes of this hanging boot screen, and a step-by-step troubleshooting guide for maintenance engineers, setup technicians, and machine shop owners. The software isn't crashed; it is waiting indefinitely

| | Primary Cause | Recommended Fix (Priority Order) | | :--- | :--- | :--- | | Machine idle for weeks/months, then hangs on "starting" message | Memory backup battery discharged, causing parameter loss | (1) Check / replace mainboard battery; (2) Reload from a saved parameter backup; (3) Manually re-enter machine parameters. | | Intermittent hangs; works fine after another hard reset | Failing power supply capacitor; loose internal connector | (1) Check mainboard for bulging capacitors; (2) Reseat all internal connectors; (3) Verify power supply voltages with a multimeter. | | System hangs after a power failure or "brown-out" | Corrupted file in FROM or SRAM due to improper shutdown | (1) Access Boot Monitor and perform a Controlled Start; (2) Attempt an SRAM clear; (3) Perform a full system restore. | | Hangs accompanied by clicking/grinding sounds from cabinet | Mechanical failure of the legacy HDD (Hard Disk Drive) | (1) Do not power cycle repeatedly ; (2) Replace the HDD immediately; (3) Restore the system from a full image backup to a new SSD if possible. | | Hangs at same point always; mainboard LED shows a specific non-progressing code | Hardware fault on mainboard (CPU, RAM chip, or core logic) | (1) Attempt Boot Monitor for any response; (2) If no success, the mainboard requires professional repair or replacement by FANUC or an authorized shop. |

Select to attempt saving your current parameters to a PCMCIA card (if the system allows it).

While a low battery usually triggers a specific "Battery Low" alarm before a shutdown, a completely dead battery combined with a long power-off period can lead to memory loss or corruption.

The message is a standard part of the Fanuc controller's boot process, but if it remains on the screen for several minutes without progressing, it indicates a critical system hang. This typically happens when the controller cannot load the core software from its internal memory or finish its initial self-checks. Common Causes for System Hangs