The basic power-up process

To turn on your Chromecast, plug the device into an available HDMI port on your TV, then connect the USB power cable to the Chromecast and plug the other end into a power outlet or USB port. The device will boot automatically — you do not need to press a power button. Within 30 seconds to a minute, a setup screen will appear on your TV showing a four-digit code and instructions to set up the device using your phone or computer.

If nothing appears on your TV after a minute, check that the HDMI cable is fully inserted into both the Chromecast and the TV, and that your TV is set to the correct input. Use your TV remote to cycle through inputs until you see the Chromecast setup screen.

Key Takeaways

  • Chromecast powers on automatically when you plug in both the HDMI and USB cables — there is no power button to press.
  • The setup screen appears on your TV within one minute if the connections are find and your TV is on the correct input.
  • If you see nothing, check that both cables are fully inserted and your TV remote is set to the HDMI input where you plugged in the Chromecast.
  • Once the four-digit code appears on your TV, use your phone or computer to complete the setup by connecting to your Wi-Fi network.

Checking your cables and connections

The most common reason a Chromecast does not turn on is a loose cable connection. Push the HDMI connector firmly into the HDMI port on the back or side of your TV until you hear or feel a click. Then check that the USB power cable is fully inserted into the Chromecast's USB port and that the other end is plugged into a working power outlet or USB port on your TV.

If your TV has a USB port, you can power the Chromecast from it instead of using a separate outlet. However, some TV USB ports do not provide enough power. If the Chromecast does not start after 60 seconds, unplug the USB cable from the TV and plug it into a wall outlet instead.

What to do if the setup screen does not appear

If you have plugged in both cables and waited a full minute but still see nothing on your TV, the problem is usually the input selection. Pick up your TV remote and look for a button labeled "Input," "Source," or "HDMI." Press it and a menu will appear showing all available inputs. Select the HDMI port number where you plugged in the Chromecast — if you are not sure which one, try each HDMI input until the Chromecast setup screen appears.

If you cycle through all HDMI inputs and still see no setup screen, unplug the Chromecast for 30 seconds, then plug it back in and wait another minute. This resets the device. If the screen still does not appear after the restart, the Chromecast may have a hardware problem and may need to be replaced.

Completing the setup after power-on

Once the four-digit code appears on your TV screen, you are ready to finish setup. On your phone or computer, open the Google Home app (on Android or iPhone) or go to google.com/chromecast in a web browser. The app or website will prompt you to enter the four-digit code shown on your TV. After you enter the code, you will be asked to select your Wi-Fi network and enter the password.

The Chromecast will connect to your Wi-Fi and complete setup in about two to three minutes. Once setup is done, you can cast videos, music, photos, and web pages from your phone, tablet, or computer to your TV.

Turning the Chromecast off and on again

After the initial setup, you do not need to turn your Chromecast on and off. The device enters a low-power state when you are not using it and wakes up automatically when you send it content to cast. If you want to completely power down the Chromecast, straightforward unplug the USB cable from the power outlet. Plug it back in whenever you want to use it again.

If the Chromecast is not responding to casting requests, unplug it for 30 seconds and plug it back in. This soft reset often fixes connection problems without requiring you to set up the device again.

Troubleshooting power and display issues

If the Chromecast is plugged in but your TV shows a black screen instead of the setup screen, the device may not be receiving enough power. Try plugging the USB cable into a different power outlet, or use a powered USB hub instead of plugging directly into your TV. Some TV USB ports deliver less than the 2 amps the Chromecast needs.

If the setup screen appears but then goes black, or if the screen flickers, check that the HDMI cable is not bent or damaged. A damaged cable can cause intermittent connection loss. If you have a spare HDMI cable, try swapping it in to see if the problem goes away.

Frequently Asked Questions

Do I need to press a button to turn on Chromecast?

No. Chromecast has no power button. It turns on automatically when you plug in the USB power cable. The device will boot within 30 seconds to a minute.

Why is my TV screen black after I plugged in the Chromecast?

Your TV is probably set to the wrong input. Use your TV remote to find the Input or Source button, then select the HDMI port where you plugged in the Chromecast. If you are not sure which port, try each one until the setup screen appears.

Can I power the Chromecast from my TV's USB port?

Yes, but only if your TV's USB port provides enough power — at least 2 amps. If the Chromecast does not start or keeps restarting, plug the USB cable into a wall outlet instead. TV USB ports often do not deliver enough power.

What do I do if nothing happens after I plug everything in?

Wait a full minute for the device to boot. Then check that both the HDMI and USB cables are fully inserted. If the setup screen still does not appear, unplug the Chromecast for 30 seconds, plug it back in, and wait another minute.

Do I have to turn off my Chromecast when I am not using it?

No. The Chromecast enters a low-power standby mode automatically. You can leave it plugged in all the time. It will wake up and respond to casting requests whenever you need it.