If your hardware is functional, the issue is likely corrupted software or parameters. You can bypass the standard startup loop by entering the , a basic input/output system embedded deep in the control. How to Access the Boot Screen Power down the CNC machine completely.

Release the keys only when the dull black-and-yellow menu appears.

The next time you see a FANUC robot spring into action, moving with fluid, hydraulic-like grace, remember the few seconds before the movement. Listen for the click of the contactors and the initialization sequence.

Dust, oil mist, and heat degrade circuit boards prematurely. Ensure control cabinet cooling fans operate efficiently and that heat exchangers are clean to prevent logic chips from overheating and freezing. To help diagnose your specific issue, let me know:

If the hardware passes initial inspection, the focus shifts to the software and configuration.

FANUC power supplies are resilient, but a 24VDC supply that is dropping to 19V or spiking to 30V due to a failing PSU can cause the CPU to reset mid-boot. The message appears, then the watchdog timer resets the CNC, looping endlessly.

[Freeze Screen] ──> Isolate Peripherals ──> Check Power Supply ──> Access Boot Screen ──> Backup/Restore Step 1: Isolate External Components

If you have a known good backup file (SRAM.FDB or similar) on a memory card: Select from the Boot System menu. Select RESTORE (CARD -> CNC) .

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.

Seeing the message frozen on your FANUC CNC monitor is a common yet frustrating issue. It means the CNC control booth has powered on, but the main operating system cannot finish loading.

on the Teach Pendant while powering back up to enter the Boot Monitor menu. INIT Start . Note: This may require reloading a backup. Hardware and Software Recovery

If a new software option (PAC code) was recently installed, the system may hang for up to an hour while it performs background updates and backups. Hardware Failures: Loose or faulty components, specifically the FROM/SRAM module

What is the of your FANUC control (e.g., 0i-D, 31i-B)?