Disconnect any memory cards (PCM-CIA or SD cards) from the front slots. Disconnect USB drives from the operator panel. Unplug Ethernet or serial RS-232C communication cables.
If the boot screen allows it, immediately back up the SRAM to a PCMCIA card or USB drive to preserve remaining parameters, pitch error compensations, and tool offsets.
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When a Fanuc controller gets stuck on this screen, the root cause is often related to either data corruption or hardware failure: fanuc starting system software please wait
The most common cause. The system tried to save data during shutdown but failed, causing a corrupted image.
Did this error happen suddenly during operation, or for a long period?
Press and hold the and NEXT keys on the teach pendant while turning the power back on. Disconnect any memory cards (PCM-CIA or SD cards)
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.
Reseating the SRAM or DRAM chips can sometimes clear temporary contact issues, though removing them may wipe unsaved data. Attempt a Controlled Start Turn off the controller.
If the power supply drops below its required +5V, +24V, or +15V thresholds, the processor will freeze mid-boot. If the boot screen allows it, immediately back
In the Boot Screen menu, use the arrow keys to navigate to . Select SRAM CLEAR or ALL SRAM CLEAR . Confirm the action.
The pendant cannot communicate with the controller, causing it to stall.