HP zx2000 Getting Started Manual page 38

Troubleshooting
2–10
NOTE: If you miss the beep code, send the signal again. Press the
power supply button for 3 seconds, then release it once the sound
begins.
The e-buzzer also emits an electronic signal that can be sent through a
telephone line to an authorized help desk or HP Support. This signal
can be decoded by help desk equipment to identify the workstation
model and serial number as well as details about any faults. To send
this signal to HP Support, hold your telephone next to the front bezel
when the system is booting.
Getting Started Guide