Start with the simple checks. Change one thing at a time so you can tell which step helped.
A saved network issue, router outage, VPN or macOS configuration can prevent a Mac from getting online. First, note what changed recently and whether the same issue affects another device. This helps separate a device-specific fault from a wider network or service issue.
Troubleshooting steps
Check the basics
Check whether other devices can use the same Wi-Fi and whether the Mac sees the network. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Review the settings
Turn Wi-Fi off and on, then reconnect by selecting the correct network. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Test one change
Restart the Mac and router, then temporarily disconnect a VPN you manage. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Confirm the result
Install available macOS updates after backing up important work. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Helpful note
On a managed Mac, ask your administrator before removing profiles or changing network controls.
When to get more help
If these checks do not resolve the issue, contact the relevant device maker, internet provider or app support team. Include the exact model, software version, any error message, what you have already tried and when the problem began. Avoid sharing passwords, verification codes or private account details in a public forum.
For equipment that is hot, damaged, wet or making unusual electrical sounds, stop using it and seek qualified support. Do not open power supplies, batteries or mains-powered equipment.
Settings and menu names vary by model and software version. Use the manufacturer's current instructions for device-specific steps, and back up important files before making changes that could remove data.