Windows 10 more than one screen from laptop


hi guys, not sure this is the correct place to post my inquiry.
we have a laptop running window 10. i have HDMI out running to a two way HDMI distribution that serves two other screens for karaoke. all is fine with this and works as it should. when karaoke is on it gives words etc on 2 screens.
now the problem is i was trying to add further screens that are already their for football etc. they already distribute via modulator then RF.
at one of the tvs that has HDMI cable i took this and plugged it into a modulator and ran coax to add into existing distribution.
all good only problem is when i connect the HDMI cable to modulator all screens revert to whatever is on desktop so rather than having the words etc on all screens i now have whatever is on desktop, pull cable out of modulator and it reverts back to the way it should be. i have had a play about in screen settings on laptop but cant seem to find solution. any suggestions would be appreciated.


TK Veteran
You don't mention what make of Laptop it is, are the manufacture updates, up to date? I would start by checking the Bios and Graphics are on the latest Versions? hope it helps?
Thunderbolt 3, which uses the new USB Type-C connector standard, is the newest way for laptops and tablets to output video. The advantages are obvious: a single cable can handle video, audio, standard data transmission (for external hard drives or a wired Internet connection) and power, all at the same time. Not only does this reduce clutter on your desk—assuming you have the hardware to take advantage of it, of course—it means laptops can be made smaller and thinner by consolidating ports.

So, if you have a laptop with Thunderbolt 3 and a Thunderbolt-capable monitor, this is by far the best solution. You can just hook up each monitor to one Thunderbolt/USB-C port.

However, it’s rarely that simple. Unless you have a very new laptop and very new monitors, you’ll probably need a bit more to make this work:

If you have a laptop with multiple Thunderbolt/USB-C ports but older monitors that don’t have Thunderbolt input, you’ll need some sort of adapter for each monitor, like this USB-C to HDMI or this USB-C to DVI adapter. Remember, you’ll need one adapter for each monitor you’re connecting.
If your laptop only has one Thunderbolt/USB-C port, you’ll likely need some sort of docking station to connect two monitors to one port. We recommend checking out this Dell Thunderbolt Dock, though there are others out there as well. Note that some laptops, like the small one-port MacBook, do not support running multiple displays from one port using these docks, so check your laptop’s specifications, and if you’re going to try a dock, buy from a store with a good return policy in case it doesn’t work.

Thunderbolt has a massive amount of video bandwidth, and it’s more that capable of supporting multiple standard monitors (the new Macbook Pros can output to two 5K displays at once, so long as you have the right adapters). Specialized adapters—basically mini-laptop docks—are designed for the purpose of regular docking to a multi-monitor setup with mice, keyboard, and other connections.

Once USB-C and Thunderbolt become more common on laptops and monitors, it’ll be the best option around for connecting to just about any kind of video output. That may take a while, since some manufacturers (like Microsoft) seem oddly hesitant to adopt the standard.

For Most Older Laptops: Get a Display Splitter Box
If you have an even slightly older laptop, it probably doesn’t have Thunderbolt/USB-C, instead sporting a VGA, DVI, HDMI, or DisplayPort port. This will let you easily add an external monitor, but if you want to connect two, things get more complicated. check out the post right here about cables

Most laptops only have a single video-out option, with a rare few (like some of Lenovo’s ThinkPad line or older Macbook Pros) offering multiple ports. It’s sometimes possible to use two ports at once for multiple external monitors, but this is rare, as manufacturers tend to expect you to use your laptop’s screen and a monitor together.

So you’ll likely have to turn to a third-party solution, like the Matrox line of dual- and triple-head docks, which use a single video cable to output to multiple monitors. These are a bit expensive, but they’re probably the best solution for most people. Just keep in mind that they’ll be limited by your laptop’s graphics card, so if you have integrated graphics, don’t expect to run a bunch of 4K displays without problems.

A Cheaper, but Less-Than-Ideal Option: USB Adapters
If those multi-port docking stations are just too much money for you, there is a cheaper option. While older versions of the Universal Serial Bus standard weren’t designed to handle video-out, since version 2.0 companies have made handy adapters that can turn any USB port into a monitor-out port—like this USB-to-HDMI adapter from Cable Matters. The vast majority of these adapters are using Intel’s DisplayLink technology.

This option has a lot of advantages. Not only is it an easy way to get video-out on almost any modern Windows or macOS machine, it’s inexpensive, portable, and expandable. It’s possible, at least technically, to add as many monitors as your laptop has USB ports in this fashion.


It is clear , your Laptops graphic card is not supporting the additional changes you are making with the modulator.