Is An External Device Not Working - HP Compaq Troubleshooting Manual

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Is an External Device Not Working?

If an external device does not function as expected:
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Turn on the device exactly as instructed in the device
documentation. (Some optional devices, such as external
monitors, printers, and devices connected to a parallel
connector, must be turned on before the notebook is
turned on.)
■
Verify that:
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Install the latest available system ROM (read only memory).
For instructions, refer to your model-specific documentation.
1–4
The device is connected to the correct jack, port, or
connector.
All device connections are secure.
The device is receiving adequate electrical power.
The correct device drivers are installed.
Troubleshooting