HP 3030 - Manual (Page 101)

The device control panel display has black lines or dots, or
becomes blank
CAUTION Static electricity can cause unexpected black lines or dots to appear on the device control
panel display. Do not touch the device control panel display if there is a chance that you have
collected a static electric charge (for example, by walking on carpet in a low-humidity
environment).
Was the device exposed to an electric or magnetic field?
Unexpected lines or dots might appear on the device control panel display, or the display
might become blank if the device is exposed to an electric or magnetic field. To resolve this
problem, perform the following procedure:
1. Turn the device off.
2. Remove the device from the electric or magnetic field.
3. Turn the device on again.
ENWW The device control panel display has black lines or dots, or becomes blank 91