Fanuc Starting System Software Please Wait Here

Sometimes, after a controlled shutdown or a battery replacement, the system performs a memory check which can take longer than usual. Wait at least 5 minutes to ensure it isn't just a slow boot.

If the battery voltage drops below 2.7V, the SRAM becomes unstable. On the next power cycle, the control attempts to validate the SRAM checksum. When it fails, the boot process can freeze at the "starting system software" screen because the control is unsure if it has a valid environment to load into.

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Modern FANUC 30i/31i/32i controls feature an embedded data server or a user SD card slot. An improperly formatted SD card, a corrupted boot image on the card, or a stuck card reader can confuse the IPL (Initial Program Loader). The control may try to boot from external media before internal flash, resulting in a hang.

: Ensure that the system configuration is correct. If recent changes have been made to the hardware or software configuration, verify that they are correctly set up and supported. Sometimes, after a controlled shutdown or a battery

Access the again by holding the far-right softkeys on startup.

Use a digital multimeter to measure the outputs on the FANUC power supply unit (PSU). Verify the stability of the rails. On the next power cycle, the control attempts

A FANUC system hanging on the "starting system software please wait" message is certainly a disruptive event, but it is rarely a mystery. By applying a methodical troubleshooting approach—starting with a simple power cycle, checking for loose connections, and progressing through battery checks and boot monitor diagnostics—the majority of causes can be identified and resolved. Ultimately, the best defense against a prolonged and costly shutdown is a proactive commitment to regular data backups and preventive maintenance. This ensures that even in the face of a serious software or hardware failure, your path to recovery is clear and your machine can be returned to operational status with minimal downtime.

Most FANUC controls have an hidden Initial Program Loader (IPL) menu. To access it:

30 seconds to 2 minutes. Stuck Duration: If the message persists for more than 5–10 minutes without change, there is a hardware or software corruption issue.

Diagnosing and fixing hardware problems requires advanced skills and specialized equipment. At this point, it is strongly recommended that you contact FANUC's official support or an authorized service center. Swapping entire boards (like the main board) with a known good unit can quickly help isolate the problem.