Symptoms
- Light on the Chromecast blinks continuously
- Device never shows up in the Google Home app
- TV shows no signal on that HDMI input
- Setup process times out repeatedly
Likely causes
- CommonWeak or incompatible Wi-Fi signalChromecast needs a stable 2.4GHz or 5GHz connection depending on model.
- CommonInsufficient USB powerPowering from a TV's USB port instead of a wall adapter often isn't enough.
- PossibleGoogle Home app cache or version issueAn outdated Home app can fail to complete setup.
- PossibleRouter blocking new device connectionsSome routers require manual approval for new devices to join.
- Less commonDevice firmware stuck mid-updateAn interrupted update can leave the device in a blinking, unresponsive state.
What to do
- Plug the Chromecast into a wall outlet using the included power adapter, not the TV's USB port.
- Restart your router and wait for it to fully come back online before retrying setup.
- Update the Google Home app to the latest version on your phone.
- Hold the button on the Chromecast for about 25 seconds until the light behavior changes, which triggers a factory reset.
- Move your phone close to the Chromecast during setup to ensure a strong Bluetooth/Wi-Fi connection.
- Check your router's connected devices list for any new device pending approval.
- If the light never changes behavior after a reset, the device may be defective.
When to call a pro
If a factory reset doesn't resolve it and the device is still under warranty, contact Google support for a replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.