What stopped working?

Pick the closest match. Each guide starts with the fix most likely to work and tells you when to stop and call us in.

Try these before anything else

Restart the thing that's misbehaving. Use a full restart, not sleep or closing the lid. It clears more faults than any other single step.
Check whether it's only you. Ask a colleague, or try another device. If everyone is affected, the fault is probably shared equipment, so don't keep changing settings on your own computer.
Think about what changed. A recent update, a new password or a moved desk is often the cause. It's also the first thing we'll ask you.

Still stuck? See what to send us so we can start without a round of questions.