Xserve: USB, FireWire, and optical drive do not respond
Xserve may exhibit a symptom where USB devices, FireWire devices, and the optical drive do not respond and external mass storage devices do not mount.
Symptoms may include:
The keyboard and mouse do not respond.
FireWire devices do not appear on the Desktop or do not become available to the file system when you connect them.
Discs do not appear on the Desktop, or do not become available to the file system.
Volumes do not mount.
Xserve starts up to a flashing question mark.
Xserve may be locked. Unlock Xserve using the Allen key that came with the server. Once the external mass storage volumes mount, you can lock the server again.
You can determine that the server is locked if the yellow security LED on the front panel is on.
![No alt supplied for Image](https://cdsassets.apple.com/live/7WUAS350/images/os-x-server/security_led.png)
Power Button Enclosure lock System Identifier