The #1 cause is a physical switch
Both ecosystems ship a hardware microphone kill-switch, and both get bumped while dusting. Echo/Alexa: a red light ring or bar means the mic is off — press the crossed-circle microphone button to bring it back. Google Nest speakers: an orange light means the switch on the back (next to the power cord) is flipped to off. No light reaction at all when you talk? That is this switch until proven otherwise.
Restart it like any computer
Unplug thirty seconds, replug. These are small Linux computers running for months; Google lists the reboot second on its own fix list.
Watch the lights while you speak
Say the wake word and watch: lights spin/blink = it heard you and the problem is downstream (network); no reaction = mic switch, or it simply cannot hear you over the TV — move it or speak up once as a test.
Check the Wi-Fi it thinks it’s on
Speakers answer “I’m having trouble connecting” when the network changed under them. New router or new password = re-run setup in the Alexa / Google Home app (the device appears as needing setup or via Change Wi-Fi in its settings).
Alexa answering with just a chime?
That is Brief Mode working as designed, not a fault — Alexa app → Settings → Voice Responses if you want the talking back.
Last resort — and the button holds are longer than you think
Resets wipe the device from your account, so exhaust the list above first. Echo (4th/5th gen): press and hold the Action button (the dot) around 25 seconds — the ring pulses orange, goes dark, then returns in setup mode; most people give up at ten seconds and think it failed. Nest Mini: flip the mic switch off (lights turn orange), then press and hold the center of the device about 15 seconds total — it confirms with a sound. Nest Audio: same pattern, hold the center top. Google notes you cannot factory-reset these by voice or app — it is always the physical hold. Then re-add the device in the app as if new.
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More guides: Smart plugs offline · Bluetooth pairing fixes · Our smart home installs
Quick answers
It hears me but says it can't connect.
Network side: restart the speaker and the router; if it persists, the service itself may be having an outage — check a status page before resetting anything. Voice assistants are cloud services; no internet, no answers.
It responds from the wrong room.
Multiple devices heard you and the system picked its best guess. Move devices farther apart, and in the app give each room-accurate names — 'Kitchen' responding to bedroom requests usually traces to a device someone relocated without renaming.
Alexa/Google suddenly can't control my smart lights.
The speaker is fine — the light's own integration lost its link. Re-link the light brand's skill/service in the Alexa or Google Home app, and check the light's own app sees it online first.
Do these devices listen to everything I say?
They buffer audio locally listening only for the wake word; audio streams to the cloud after the wake word triggers (the light ring/dots show when). The mic kill-switch is a true hardware cut on both brands if you want certainty during private conversations.