HighSecLabs SK21D-3 User Manual page 23

Video
Problem: No video image in user display (all channels)
Solutions:

Check that displays are properly powered.

Check that video cable is properly secured at both sides.

Check at the displays' on-screen menu that sources selected
match the cables connected to displays.

Check if display video mode is the same as computer's video
mode (e.g. DVI and DVI, etc.).

Check that displays' diagnostic LED is steady green – if not,
change displays, change displays' cables or call technical
support.
Problem: No video image in user display (specific channel)
Solutions:

Reboot product first, then disconnect and reconnect the
video cable and reboot the computer.

Check that the video cable connecting computer and product
is properly secured at both sides.

Check that computer video output is sent to the connected
video connector (if computer supports multiple displays).
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
Check that computer resolution matches connected display
capabilities.

Connect the display/s directly to the computer to confirm
that video output is available and that a good image is shown.
Problem: Bad video image quality (some or all channels)
Solutions:

Check that all video cables are properly connected to
product, computer, and display.

Check that cables are original cables supplied by HSL.

With everything connected, power-cycle the product to reset
the video. Make sure the Video Diagnostic LED is solid green.

Check that the displays that you are using support the
resolution and refresh-rate setting on computer.

Lower the video resolution of your computer.

Connect displays directly to computer showing bad video
image to see if problem persists.
2-PORT SINGLE-HEAD SECURE KVM: SK21D-3 – DVI-I VIDEO, SK21P-3 – DISPLAYPORT VIDEO, SK21H-3 – HDMI VIDEO
Section 5 - Troubleshooting