When the system hangs indefinitely on the "Please Wait" screen, the bootloader sequence has been interrupted. The processor is waiting for a response or a file transfer that is not happening. Common Causes of the Boot Hang
Note: If you cannot access this boot screen, your issue is likely a catastrophic hardware failure on the master board or a completely dead power supply module. Step 3: Check and Clear the SRAM (With Caution)
Use a multimeter to check the test points on the FANUC power supply module. If the voltages fluctuate or drop when the screen attempts to load, the PSU needs to be rebuilt or replaced. 📋 How to Prevent Future Boot Failures
If you work on a CNC manufacturing floor, few sights are as anxiety-inducing as a control panel that refuses to boot. You flip the main breaker, press the green power-on button, and instead of the familiar FANUC logo followed by the NC/PLC ladder display, you are greeted by a stark, frozen message: fanuc starting system software please wait
While the steps above provide a path to recovery, it's far better to avoid the "Please wait..." stall from happening at all. The key is a proactive preventive maintenance program, which involves:
When a Fanuc controller gets stuck on this screen, the root cause is often related to either data corruption or hardware failure:
When a FANUC CNC (e.g., Series 0i, 30i, 31i, 35i) powers on, its embedded Windows Embedded or FANUC proprietary real-time OS must load the from non-volatile storage into DRAM. The sequence is: When the system hangs indefinitely on the "Please
Just like a desktop computer, a CNC controller relies on intact system software. Sudden power loss, improper shutdowns, or an aging backup battery can corrupt the SRAM (Static RAM) or system files, breaking the boot sequence. 2. Failed FROM/SRAM Modules or Master Board
Stuck at "Starting System Software. Please Wait": A Troubleshooting Guide for Fanuc Controllers If your Fanuc controller is stuck on the "Starting System Software. Please Wait"
Locate the two rightmost softkeys beneath the CNC display screen (typically the two keys furthest to the right under the monitor). Press and hold these two softkeys simultaneously. Step 3: Check and Clear the SRAM (With
This is not an error, but a critical state in the boot process. However, when it persists for an unusually long time (more than 5–10 minutes) or appears in a boot loop, it signals a fundamental issue with the controller’s software integrity, hardware, or data storage.
Unplanned downtime can cost thousands of dollars per hour. Implement these preventative measures to protect your FANUC-controlled machinery: