The Diagnostic LED blinks red 4 times (once per second): This indicates power failure.
To resolve the issue, complete the following steps:
Perform the power supply self-test.
Open the access panel, and ensure that the necessary power supply cables are connected to the system board.
Locate a faulty device by removing all devices, and then reinstalling one at a time until the workstation fails:
Disconnect AC power to the workstation.
Remove all the devices.
Reinstall a device.
Reconnect AC power.
Replace the device causing the failure. Continue adding devices to ensure that all devices are functioning properly.
Verify the power supply functionality.
Disconnect AC power.
Remove all internal power supply cables from the system board.
Plug in AC power.
If the power supply fan spins, and the LED illuminates, then the power supply is good. Replace the system board.
If the power supply fan does not spin, or the LED does not illuminate, then replace the power supply.