Work through these checks in order
Inspect the charging cable, adapter, outlet and visible charging port. If safe, test with a known-working compatible power source.
A deeply discharged battery may show no immediate sign of life. Leave it on reliable power for a while before repeating checks.
Listen for sounds, feel for vibration, watch LEDs and see whether a connected computer detects the device.
Use the restart sequence for the exact model. Avoid random button combinations or repeated resets.
If the device is hot, swollen, wet, damaged, smells unusual, or still has no response after basic checks, stop and seek qualified service.
Before an erase, restore or repair decision
Confirm what data is backed up, what a reset or restore will remove, and whether you still need access to account credentials or authentication methods stored on the device.
When professional service makes sense
Hardware damage, repeated power failure, liquid exposure, battery swelling, damaged ports, broken displays and problems that persist after low-risk software checks can require qualified inspection.