If the system hangs or freezes on the "FANUC Starting System Software Please Wait" message, it may indicate a hardware or software issue. In this case:
Follow this structured troubleshooting sequence to isolate and fix the root cause of the boot failure. 1. Perform a Controlled Power Cycle
FANUC stores system software on a memory module (often called the "FROM" or Flash ROM). If a critical sector becomes corrupted due to a sudden power loss during a previous write operation, the boot loop hangs. This is especially common if the machine was powered off while a parameter write or a macro compilation was in progress.
keys (or PREVIOUS and NEXT on some models) while powering on to enter the Boot Monitor (BMON) menu. Select INIT Start This will wipe your settings, so you must have an "All of the Above" (AOA) Image backup ready to restore. Restore an Image Backup: fanuc starting system software please wait
Insert your facility's master backup PCMCIA card or USB drive containing the machine's original configuration files.
: Commonly means the system is waiting or has a deep hardware fault. Only a dot
The infamous "FANUC Starting System Software Please Wait" message! If the system hangs or freezes on the
Physical hardware failure is less common but does occur. Electrolytic capacitors on older FANUC 16/18/21 series main boards (circa 1995–2005) degrade over time, causing unstable voltage rails. Also, the "Master PCB" or "Main CPU Board" (e.g., A16B-3200-xxxx) can develop cracked solder joints on the DRAM chips.
With the power completely off, gently reseat the memory cards (FROM/SRAM modules) and any additional plugin boards. Clean the contacts with electrical contact cleaner if dust or oil mist has infiltrated the cabinet. 3. Dead Backup Battery
Based on field service data from hundreds of FANUC repair logs, the "System Software Please Wait" lockup can be traced to five primary culprits. Perform a Controlled Power Cycle FANUC stores system
Always ensure the robot is in a safe position before attempting recovery, as system resets can lose "Mastering" data, causing the robot to lose its sense of physical position.
One minute passes. Then five. Then fifteen. The machine remains frozen in this limbo, neither fully operational nor completely dead. For any production manager or maintenance tech, this is a nightmare scenario. That single message represents costly downtime, missed deadlines, and mounting stress.
