Starting System Software Please Wait - Fanuc

The main board constantly communicates with option cards plugged into the backplane, such as: Fast Ethernet cards Data Servers PCMCIA card slot assemblies Additional axis control cards

Faulty DRAM or FROM modules prevent the system from successfully copying and executing the boot software.

The motherboard is getting power and attempting to boot.

Open the cabinet and check the small red 7-segment display on the CPU. A flashing number or a '1' often indicates a parity error. fanuc starting system software please wait

Protect sensitive CNC electronics from industrial grid fluctuations, brownouts, and voltage surges by using dedicated power conditioners.

Use surge protectors and isolation transformers to shield the CNC control from voltage spikes and brownouts, which are primary causes of data corruption. If you'd like to narrow down the problem, tell me:

Before removing hardware, perform a clean power reset. Turn off the machine's main breaker. Wait at least two minutes to allow all capacitors in the power supply and servo amplifiers to discharge fully. Turn the power back on to see if the system clears the glitch. 2. Inspect Control LEDs The main board constantly communicates with option cards

| Symptom | Most Likely Cause | Fix | | :--- | :--- | :--- | | Stuck on "Please Wait" + Boot Monitor inaccessible | Dead CPU board or failed system FROM | Replace main board or reprogram FROM using FANUC's boot EPROM service | | Boot Monitor works, but normal boot hangs | Corrupted system software | Reload system software via PCMCIA or CF card (requires FANUC software package) | | "SRAM PARITY" before hang | Low SRAM battery or bad SRAM chip | Replace battery (while powered on to save data). If chip failed, replace SRAM module and restore from backup | | Hangs only when servo drives are connected | FSSB communication error or dead servo board | Disconnect FSSB fiber optic cable. If CNC boots, one drive or fiber loop is bad | | Intermittent hangs (sometimes boots) | Failing 24VDC power supply or loose backplane connection | Measure voltage at main board test points (TP1, TP2). Replace PSU (e.g., FANUC A86L-0001-xxxx series) |

The Starting System performs the . This is the "bootloader" phase. You might see a cursor blinking in the top-left corner of the teach pendant or a sequence of numbers ticking by on a small LCD. This is the software mapping the hardware. It asks: Is the RAM working? Is the main board communicating with the axis control boards? If this phase fails, the machine stays dead, usually requiring a "System Restore" from a backup.

Turn the controller off, wait at least two minutes for all components (including the pendant) to fully discharge, then turn it back on. A flashing number or a '1' often indicates a parity error

Before ordering expensive replacement boards, follow this sequential diagnostic process to isolate the failure.

Then, nothing happens. The clock ticks, minutes pass, and the control fails to load its main operating screen.

It is a situation every CNC operator or maintenance technician dreads. You flip the power switch on your FANUC control panel, the screen lights up, and it displays the message:

If the "starting system software" message persists after a cold start, or if you receive a message, you likely have a hardware failure on the mainboard or corrupted BIOS. In these cases, you will need to contact Fanuc support or a specialized CNC repair technician.