LEDs Are Off or Blinking Green on PXI or PXIe Chassis

Updated Feb 23, 2026

Reported In

Hardware

  • PXI Chassis
  • PXI Power Supply
  • PXIe-1085

Issue Details

My PXI or PXIe chassis does not power up, and the LEDs and fans do not turn on as expected. In some cases, all front-panel LEDs flash green while the fans run at full speed. On other systems, the rear Power Supply LED flashes green even though this LED state is not documented in the chassis manual.

Solution

If your chassis does not power on normally, try the following steps to identify and resolve the issue:

  • Remove all modules from the chassis and attempt to power it on again.
  • Verify that the chassis is connected to a working power outlet.
  • Turn off the chassis and disconnect AC power, then inspect the chassis for a tripped circuit breaker. If it is tripped, reset the breaker before reconnecting AC power and turning the chassis back on.
  • Try using a different power cord.
  • Test the power supply in another compatible chassis. If this second chassis does not power on, the power supply may require repair or replacement.
  • If available, try powering the chassis using a different power supply.
  • For chassis that use dual power supplies, switch the power supplies between the rear slots and test the chassis again.

If the front-panel LEDs blink green and the fans operate at full speed, the chassis firmware may be corrupted. Update or reinstall the chassis firmware and restart the system.

If these steps do not resolve the issue, contact NI Support for further assistance.