HP Compaq dx2390 Troubleshooting Manual page 15

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If you have installed an operating system other than the factory-installed operating system, check
to be sure that it is supported on the system.
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If the system has multiple video sources (embedded, PCI, or PCI-Express adapters) installed and
a single monitor, the monitor must be plugged into the monitor connector on the source selected
as the primary VGA adapter. During boot, the other monitor connectors are disabled and if the
monitor is connected into these ports, the monitor will not function. You can select which source
will be the default VGA source in Computer Setup.
CAUTION:
to the system board. You must disconnect the power cord from the power source before opening the
computer to prevent system board or component damage.
ENWW
When the computer is plugged into an AC power source, there is always voltage applied
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