How to connect two monitors to a laptop, even with one HDMI port

Written on 5 November 2026

Why one HDMI port is not enough on its own

An HDMI port sends out one picture. Put a splitter on it and both monitors show exactly the same thing, which is fine for a presentation and no help at all if you want your inbox on one screen and a spreadsheet on the other.

The second picture has to come from somewhere else: another video port on the laptop, or a docking station that takes its signal from the USB-C or Thunderbolt port.

Check your USB-C port before you buy a cable

Most business laptops from recent years have at least one USB-C port, but not all of them carry video. To drive a monitor, the port has to support DisplayPort Alt Mode or Thunderbolt. A small DisplayPort symbol or a lightning bolt next to the port is the usual sign; if there is no marking, look up the specification sheet for your exact model. Our guide to the types of USB ports explains what each symbol means.

The number of ports does not decide how many screens you can use. The laptop's graphics chip does, and the manufacturer lists the number of external displays it supports in the specification, usually under graphics or display.

Two monitors without a docking station

If the USB-C port carries video, run the first monitor from HDMI and the second from a USB-C to DisplayPort or USB-C to HDMI cable, whichever matches the input on the monitor. It is cheap and it works.

The drawback shows up every morning. Two video cables and a charger go into the laptop when you sit down, and come out again when you leave. On a desk you use every day, that gets old quickly.

Connecting both monitors through a docking station

A docking station stays on the desk with both monitors, the keyboard, the mouse and the network cable plugged into it for good. The laptop connects with one USB-C or Thunderbolt cable, and on most docks that cable charges the laptop as well. When you finish, you unplug once and take the laptop with you.

The docks HP, Dell and Lenovo make for their business laptops are built for this kind of desk. We sell them refurbished: each one is tested before it is sent out and comes with a two-year warranty.

Dual monitor setup in the Windows 11 display settings

Once the cables are in, Windows needs to know you want two separate screens rather than a copy.

1. Connect the dock to mains power first, then to the laptop.
2. Make sure both monitors are switched on and set to the input the cable is in (HDMI or DisplayPort), using the button on the monitor.
3. Press Windows key + P and select Extend. Duplicate shows the same picture on every screen, and the options 'PC screen only' and 'Second screen only' switch one side off.
4. Open the display settings (Settings, System, Display) and select Identify to see which number belongs to which monitor.
5. Drag the numbered screens into the order they stand on your desk and select Apply, so the mouse pointer crosses to the right screen. The same page also lets you change the resolution, scale and layout of each monitor.

If the second monitor is not detected

Select Detect under Multiple displays on the same page. The option names above come from Microsoft Support's article on using multiple monitors in Windows. If the screen is still blank, our guide to a docking station not detecting monitors goes through the causes in order, from the input setting on the monitor to firmware.

Docking stations for dual monitors

Every dock below has at least two DisplayPort outputs. The figures are taken from the specification on each model page.

Picking one

With a Thunderbolt 4 laptop, the HP Thunderbolt 120W G4 is the obvious match. On a laptop whose USB-C port carries video, the HP USB-C Dock G5 and the Dell WD19S both handle two monitors; the WD19S charges a Dell laptop at up to 130 W, which leaves headroom for a heavier workstation. Not sure your laptop will work with one of them? Send us the model and we will check it.