LG Ultrafine power up

Hi there Wolkowitz1,

If your LG display isn't powering on at all, you may want to reach out to LG for more help:

If you have issues connecting the display

- The LG UltraFine 5K Display doesn't support daisy-chaining of displays. The three USB-C ports on the display provide additional connectivity to USB 3 devices only.

- Get help with video issues if your display doesn't power on when using the correct cable.

- If the LG UltraFine 5K Display doesn't power on after following the steps in the article above, contact LG to get service for your display.

You'll find this information here: Use the LG UltraFine 5K Display with your Mac or iPad - Apple Support

If it is powering on but the screen appears blank while connected to your MacBook Air, you'll want to be sure you worked through all the suggested steps in the related article linked in blue at the top left corner of this page:

If your display is blank or not detected

Try these steps if you don't see an image on your display.

Check your cable or adapter

Disconnect the cable from your external display from your Mac, then reconnect it. If the cable from your external display doesn't connect to the ports on your Mac, you can use a USB-C or Thunderbolt adapter. If you're using a USB-C or Thunderbolt adapter to connect a display, the adapter must be compliant with DisplayPort Alt Mode or Thunderbolt / USB 4.

Check how many displays you can connect

1. If you're connecting multiple displays to your Mac, use the Tech Specs page to find out how many external displays your Mac supports.

2. Choose Apple menu  > About This Mac, double-click your serial number, then press Command-C to copy it.

3. Go to the Tech Specs page, click the Search Tech Specs bar, press Command-V to enter your computer's serial number, then click Search.

4. Click the specs page for your Mac. The number of displays your Mac supports appears under Video Support or Graphics.

Take care.