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Is the computer set to send data to the video port? Laptops often have the external port disabled; check the BIOS. (This is often accessed by pressing F1, Esc or F2 before the OS loads. Check your documentation.) Then you can set the preferred monitor by looking at the Display settings.
Some desktops have a similar issue where only one port is active (DVI, HDMI, and VGA). You may need to connect a different monitor via the enabled port or use an adapter to get the VGA cable to mate with that port to change settings. (In the case of computers with video graphics cards and motherboard video ports, only one item is active. Try moving your cable with an adapter if needed to one of the other ports. Then change the BIOS setting if you do not want to continue using the adapter.)
Try a different video cable and make sure it is fully connected to both the computer and the monitor. Damaged cables are always suspect.
What OS are you using? Do you need to download drivers for the Broksonic? Go to www.broksonic.com and ask in the Product support section - they don't seem to have a direct link on the site. (For example some TVs are not compatible with the drivers in the Mac OS.)
Under the menu settings, make sure tv is set to CATV and not Air. CATV is for cable. Then look for tuner options or channel edit options. Find the "autoprogram" option and select it. It will scan and remember all available channels
I just looked at a TV last night for this. I don't know what you've tried yet, but I was getting that message until I went into the menu and selected the automatic channel scan. I forget what it was actually called, but you'll find it. After that, 19 digital stations came in beautifully with a cheap set of rabbit ears. (The scan will also find analog channels, which you can delete later on.) Good Luck.