Quick answer: to connect to a projector or PC on Windows 11 or 10:
- With a cable: plug an HDMI (or USB-C/VGA) cable into the PC and the projector, select the right input on the projector, then press Windows + P and choose Duplicate or Extend.
- Wirelessly: turn on the projector’s screen mirroring (Miracast) mode, press Windows + K and select the projector.
- To another PC: on the receiving PC, install the Wireless Display optional feature and open it, then press Windows + K on the sending PC.
Whether you are about to start a meeting, teach a class or watch a film on the big screen, this guide shows you the fastest way to get your PC’s image onto a projector, a TV or another computer. It also covers what to do when the projector shows “No signal”, when there is no sound, or when the device simply does not appear.
Older versions of Windows called this feature “Connect to a projector”. In Windows 10 and 11 it is split between two shortcuts: Win + P (display modes, for cables) and Win + K (Cast, for wireless).
Sommaire
- Which connection method should you use?
- Before you start: identify your ports and cables
- Ports on your PC
- Inputs on the projector
- Which adapter do you need?
- How to connect to a projector with a cable
- HDMI connection, step by step
- USB-C or DisplayPort connection
- VGA connection (and how to get sound)
- Choose the right display mode with Windows + P
- How to connect to a projector wirelessly (Miracast)
- Check that your PC supports Miracast
- Project with Windows + K
- Network projectors and manufacturer apps
- How to project your screen to another PC
- Step 1: install Wireless Display on the receiving PC
- Step 2: allow projection to this PC
- Step 3: connect from the sending PC
- Adjust resolution, sound and display settings
- Not working? Troubleshooting by symptom
- “No signal” on the projector
- No sound through the projector
- Blurry, stretched or cut-off image
- The projector or PC does not appear in Win+K
- What about a Mac?
- Frequently asked questions
- Sources and references
Which connection method should you use?
| Method | What you need | Max quality | Sound | Lag | Best for |
|---|---|---|---|---|---|
| HDMI cable | HDMI port on both sides | Up to 4K | Yes | None | Most situations, video, presentations |
| USB-C / Thunderbolt | USB-C port with video output + USB-C to HDMI adapter or cable | Up to 4K | Yes | None | Recent thin laptops without HDMI |
| DisplayPort | DisplayPort on the PC, DP or HDMI on the projector | Up to 4K+ | Yes | None | Desktop PCs, business projectors |
| VGA | VGA port on both sides + separate audio cable | Usually 1080p max, often lower | No (separate cable) | None | Older classroom and meeting-room projectors |
| Wireless (Miracast, Win+K) | Miracast-compatible PC and projector (or dongle) | Usually 1080p | Yes | Noticeable | Slides and documents, no cable at hand |
| Project to another PC | Two Windows PCs, Wireless Display feature | Usually 1080p | Yes | Noticeable | Sharing your screen with a nearby PC |
Rule of thumb: use a cable whenever you can. It is faster to set up, more reliable, and the only good option for video or anything with motion.
Before you start: identify your ports and cables
Ports on your PC
| Port | How to recognize it | Carries video? | Carries audio? |
|---|---|---|---|
| HDMI | Flat trapezoid, wider at the top. Laptops may have a smaller Mini or Micro HDMI. | Yes | Yes |
| USB-C | Small oval port. A lightning-bolt icon (Thunderbolt) or a “D” logo (DisplayPort) means video is supported. | Only if it supports DisplayPort Alt Mode or Thunderbolt | Yes, when video works |
| DisplayPort | Rectangle with one corner cut off. Mini DisplayPort is a smaller version. | Yes | Yes |
| VGA | Blue trapezoid with 15 pins and two screws. | Yes (analog) | No |
DisplayPort Alt Mode is the standard that lets a USB-C port send a video signal. If your laptop’s USB-C port has no icon next to it, check the manufacturer’s specifications page before buying an adapter.
Inputs on the projector
Look at the back or side panel of the projector. Most models made after 2015 have at least one HDMI input. Older or education models often have VGA (labelled “Computer” or “PC In”). Business projectors may also have USB-C, DisplayPort or a network (LAN) port.
Which adapter do you need?
| PC port | Projector input | What to buy |
|---|---|---|
| HDMI | HDMI | Standard HDMI cable (High Speed or better) |
| USB-C (with video) | HDMI | USB-C to HDMI cable or adapter |
| Mini DisplayPort / DisplayPort | HDMI | DisplayPort to HDMI cable |
| HDMI | VGA only | Active HDMI to VGA converter (with a 3.5 mm audio output if you need sound) |
| USB-C (with video) | VGA only | USB-C to VGA adapter |
How to connect to a projector with a cable
HDMI connection, step by step
- Turn on the projector and wait for it to warm up (usually 15 to 30 seconds).
- Plug one end of the HDMI cable into the PC and the other into an HDMI input on the projector. Note the input number (HDMI 1, HDMI 2…).
- On the projector’s remote or control panel, press Source or Input and select that HDMI input.
- On the PC, press Windows + P and choose Duplicate (same image on both) or Extend (the projector becomes a second desktop).
- If nothing appears after 10 seconds, go to Settings › System › Display, open Multiple displays and click Detect.
USB-C or DisplayPort connection
- Connect the USB-C to HDMI (or DisplayPort to HDMI) cable or adapter to the PC first, then to the projector.
- Select the matching input on the projector.
- Press Windows + P and choose a display mode.
If you get no image, try another USB-C port: on many laptops only one of them carries video.
VGA connection (and how to get sound)
- Connect the VGA cable and tighten both screws: a loose VGA plug causes colour casts or a flickering image.
- Select the Computer, PC or VGA input on the projector.
- Press Windows + P and choose a display mode.
- VGA carries no audio. For sound, connect a 3.5 mm cable from the PC’s headphone jack to the projector’s Audio In, or use external speakers.
Choose the right display mode with Windows + P
Press Windows + P at any time to switch modes. Press it again to move through the options with the keyboard.
| Mode | What it does | When to use it |
|---|---|---|
| PC screen only | Shows the image on the PC only; the projector goes blank | To pause what the audience sees |
| Duplicate | Same image on the PC and the projector | Demos, teaching, when you face the audience |
| Extend | The projector becomes a second desktop | PowerPoint Presenter View (notes on your screen, slides on the projector) |
| Second screen only | Image on the projector only; the PC screen turns off | Movies, or when the PC’s own screen is broken |
Tip: in Duplicate mode, Windows uses a resolution that both screens support, which is often lower than your PC’s. If the image looks blurry on the projector, switch to Extend or Second screen only and set the projector to its native resolution (see the settings section below).
How to connect to a projector wirelessly (Miracast)
Miracast is the wireless display standard built into Windows. It creates a direct Wi-Fi link between the PC and the projector, so no router or internet connection is needed.
Check that your PC supports Miracast
- Press Windows + R, type
dxdiagand press Enter. - Click Save All Information and open the text file.
- Look for the Miracast line. “Available” or “Available, with HDCP” means you can project wirelessly.
Most laptops sold since 2015 support it. Desktop PCs without Wi-Fi do not.
Project with Windows + K
- On the projector, open the Screen Mirroring, Miracast or Wireless input. If it has no built-in Miracast, plug a Miracast dongle into its HDMI port.
- Make sure Wi-Fi is turned on on the PC.
- Press Windows + K (or open Quick Settings and click Cast).
- Select the projector’s name in the list and accept the request on the projector if prompted.
- Click Change projection mode to choose Duplicate or Extend.
To disconnect, press Windows + K again and click Disconnect.
Network projectors and manufacturer apps
Many business and education projectors connect over the office network instead of Miracast. In that case, use the manufacturer’s free app (for example Epson iProjection) and follow the projector’s on-screen instructions, which usually show an IP address or a connection code. This method works even when the PC and projector are in different rooms on the same network.
How to project your screen to another PC
Windows can turn a second PC into a wireless screen. This is useful for showing your screen on a colleague’s laptop or on a PC already connected to a large display.
Step 1: install Wireless Display on the receiving PC
- On the PC that will receive the image, open Settings › System › Projecting to this PC.
- Click Optional features, then View features.
- Search for Wireless Display, tick it, click Next, then Install.
Step 2: allow projection to this PC
- Back in Projecting to this PC, set the options: Available everywhere on secure networks is the safest choice; set Ask to project to this PC to Every time.
- Open the Wireless Display app from the Start menu search. The PC is now waiting for a connection. (On Windows 10 and early Windows 11, the app is called Connect.)
Step 3: connect from the sending PC
- On the PC whose screen you want to share, press Windows + K.
- Select the receiving PC’s name.
- Accept the request on the receiving PC. If a PIN appears, type it on the sending PC.
Adjust resolution, sound and display settings
| Setting | Where to find it | What to do |
|---|---|---|
| Resolution | Settings › System › Display › select the projector › Display resolution | Choose the projector’s native resolution (often 1920 × 1080; check its manual) |
| Text and app size | Settings › System › Display › Scale | Increase to 125 % or 150 % if text is too small for the room |
| Screen order | Settings › System › Display (drag the numbered screens) | Place the projector on the correct side so the mouse moves naturally |
| Sound output | Settings › System › Sound › Output | Select the projector (HDMI) or your speakers |
| Main display | Settings › System › Display › Make this my main display | Keep the laptop as main display for Presenter View |
Not working? Troubleshooting by symptom
| Symptom | Most likely cause | Fix |
|---|---|---|
| “No signal” on the projector | Wrong input selected, or the PC is in “PC screen only” mode | Press Source on the projector; press Win+P and choose Duplicate |
| Projector not detected | Loose cable, faulty cable or outdated graphics driver | Reconnect, try another cable, click Detect, update the graphics driver |
| No sound | Windows is still sending audio to the laptop speakers, or you use VGA | Settings › System › Sound › Output › select the projector; with VGA use an audio cable |
| Blurry or cut-off image | Resolution or scaling does not match the projector | Set the native resolution; use the projector’s Auto/Reset image setting |
| Projector or PC missing in Win+K | Wi-Fi off, Miracast not supported, or Wireless Display not running | Turn on Wi-Fi; check dxdiag; open the Wireless Display app on the receiving PC |
| Wireless image lags or drops | Wi-Fi interference or distance | Move closer, switch to a cable for video |
| Video plays on the PC but is black on the projector | Copy protection (HDCP) on streaming services | Use an HDCP-compliant cable/adapter, or play the video on the projector’s own app |
“No signal” on the projector
- Check the input: press Source until the projector shows the input your cable is plugged into.
- Press Windows + P and select Duplicate.
- Unplug and replug the cable with both devices on, then wait 10 seconds.
- Restart the PC with the cable connected.
- Test another cable or adapter: cheap USB-C adapters are a frequent cause.
No sound through the projector
Open Settings › System › Sound and select the projector (often shown with its brand name or “HDMI”) under Output. Also check that the projector’s own volume is not muted. If you use VGA, sound needs a separate cable.
Blurry, stretched or cut-off image
Set the PC to the projector’s native resolution, then use the projector’s Auto adjust or Reset image option. Check the projector’s focus ring and keystone correction too: a blurry image is often a focus problem, not a PC problem.
The projector or PC does not appear in Win+K
Turn Wi-Fi on (even without a network), check Miracast support with dxdiag, and make sure the projector is on its mirroring input. When projecting to a PC, the Wireless Display app must be open on the receiving PC. If the graphics or Wi-Fi driver is outdated, Windows may hide the option: update Windows and your drivers (see our guide to installing a pending Windows update).
What about a Mac?
On a Mac, connect with a USB-C/Thunderbolt to HDMI adapter (or HDMI directly on some MacBook Pro models). The display usually appears automatically. Open System Settings › Displays to choose Mirror or Extend. For wireless projection, use Screen Mirroring in Control Center with an AirPlay-compatible projector or TV. Macs do not support Miracast.
✅ Pre-presentation checklist
- Check which ports the room’s projector has (ask the venue or IT).
- Bring your own cable and the right adapter for your laptop.
- Test the connection at least 10 minutes before you start.
- Set the display mode with Win+P (Extend for Presenter View).
- Select the right sound output in Settings › System › Sound.
- Turn on Do Not Disturb so notifications don’t appear on the big screen.
🛠️ Real-world case: “No signal” in a meeting room
| Setup | Recent thin laptop under Windows 11 with two USB-C ports and no HDMI; ceiling-mounted projector with HDMI input |
|---|---|
| Symptom | Projector showed “No signal” through a USB-C to HDMI adapter; Windows did not detect a second display |
| Diagnosis | The adapter was plugged into the only USB-C port that does not support video output (no DisplayPort or Thunderbolt logo) |
| Fix | Moved the adapter to the Thunderbolt port, selected HDMI 1 on the projector, then Win+P › Extend for Presenter View |
| Time | About 3 minutes once the cause was identified |
Takeaway: before blaming the projector or the driver, check that your USB-C port actually outputs video. It is one of the most common causes of “No signal” with modern laptops.
Frequently asked questions
What is the shortcut to connect to a projector in Windows?
Press Windows + P to choose how the image is shown on a projector connected by cable. Press Windows + K to connect to a wireless projector, TV or PC.
Why does my projector say “No signal” when connected to my laptop?
Usually the projector is on the wrong input, or Windows is set to “PC screen only”. Press Source on the projector to select the right input, then press Windows + P and choose Duplicate. If it still fails, try another cable or port.
Can I connect a laptop to a projector without HDMI?
Yes. Use a USB-C to HDMI adapter if your USB-C port supports video, a VGA cable for older projectors, or connect wirelessly with Miracast (Windows + K).
How do I project my screen to another Windows PC?
On the receiving PC, install the Wireless Display optional feature from Settings › System › Projecting to this PC, then open the Wireless Display app. On the sending PC, press Windows + K and select the receiving PC.
Why is there no sound from the projector?
Windows may still be sending audio to the laptop speakers. Open Settings › System › Sound and select the projector under Output. VGA cables carry no audio, so they need a separate audio cable.
Does wireless projection need an internet connection?
No. Miracast creates a direct Wi-Fi connection between the PC and the projector. Wi-Fi must be turned on, but you don’t need to be connected to a network or the internet.
What is the difference between Duplicate and Extend?
Duplicate shows the same image on both screens. Extend turns the projector into a second desktop, which lets you see your speaker notes while the audience sees only the slides.
Sources and references
- Microsoft Support – Screen mirroring and projecting to your PC or wireless display
- Epson – Connecting using Miracast in Windows 11
- [User manual of the projector used for testing – link to the manufacturer’s PDF]
