Check whether all devices are affected
If only one device fails, the issue is probably not the NBN service.
Check provider and NBN status
Use mobile data to view your provider outage page and the official NBN network-status page.
Look at equipment lights
Photograph the normal and unusual lights on the NBN connection box: The NBN-supplied device used for some connection types before your router. Full definition, modem and router.
Check power and cables
Make sure power plugs are secure. Avoid unplugging fibre or unfamiliar fixed cables.
Restart in the correct order
Power the NBN or modem device first, wait for it to settle, then power the router.
Contact your provider with notes
Tell them when it began, which devices are affected, what the lights show and which checks you completed.
Official resources
Still stuck?
Social Blade IT Services can help onsite or remotely. We explain the next step before extra work or parts.