HP 21” Color Monitor User’s Guide
Troubleshooting
The Remedies
One or more of the following messages may appear on the screen.
If ACTIVATE USING PC appears on the screen, try pressing any key on the computer, and confirm that your computer’s graphic board is completely seated in the correct bus slot.
If CHECK INPUT SELECTOR appears on the screen, try changing the input signal.
If CHECK SIGNAL CABLE appears on the screen, check that the monitor is correctly connected to the computer.
If OUT OF SCAN RANGE appears on the screen
This message shows the currently selected connector (INPUT 1 or INPUT 2). If the monitor recognizes the frequencies of the current input signal, the horizontal and vertical frequencies are also displayed.
This indicates that the input signal is not supported by the monitor’s specifications.
If you are replacing an old monitor with this monitor, reconnect the old monitor. Then adjust the computer’s graphics card so that the horizontal frequency is between 30 - 130 kHz, and the vertical frequency is between 48 - 170 Hz.