Fault-domain resolver
Diagnose a device problem in 60 seconds: find out what is actually failing before you reset it.
Three observations separate a provider outage, home-network problem, one-device failure and app-specific session.
A provider outage cannot be fixed with a factory reset. A one-app problem usually does not require a router reset. Isolating the fault protects settings and shortens the path.
No result changes the product or network. Confirm the exact model specifications before buying an adapter, cable, component or replacement.
How to narrow a problem down in a minute
Most technology problems fall into four places: the service you are using, your home network, the one device in your hand or the one app on it. The three questions on this page separate those places. If the provider reports an outage, nothing you do locally will help, and you can stop troubleshooting. If other devices on the same Wi-Fi also fail, the problem is the router, the modem or the provider. If only one device fails, look at that device. If only one app fails, look at the app, its login and its updates.
Each answer matters because the safe next step differs. A router restart helps a network fault but does nothing for one app, a factory reset removes everything and rarely fixes a cause that was elsewhere, and reinstalling an app does not fix an outage. Work from the least disruptive step to the most, and write down what you change so you can undo it.
When you know where the problem is, open the support page for that device or the error-code library for its brand. Have the model number and the exact message ready, since the fix depends on them.