HP dx2308 - Microtower PC Service & Reference Manual page 92

If you have installed an operating system other than the factory-installed operating system, check to
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be sure that it is supported on the system.
If the system has multiple video sources (embedded, PCI, or PCI-Express adapters) installed and a
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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:
applied 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.
84 Appendix C Troubleshooting
When the computer is plugged into an AC power source, there is always voltage
ENWW