HP L1755 User Manual page 15

Setting Up the Monitor
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CAUTION: The DVI-D cable supplied with this monitor is for
digital-to-digital connection only. Your computer must have a
DVI-compatible graphics card installed for use with this cable. When
connecting the DVI-D signal cable to the DVI connector on the
monitor (available on select models), you must connect the other end
of the DVI-D cable to the DVI connector on the computer.
Connecting the DVI-D Signal Cable
3–6 User Guide