“Not turning on” can mean no power at all, power lights with no picture, or a device that powers on but cannot boot Windows. Those are different faults.
Possible causes include charger, charging-port, battery, internal power or motherboard faults. Test with the correct known-good charger where possible and avoid repeatedly forcing power if there are burning smells or visible damage.
This may be a display path, RAM, BIOS/UEFI or other startup problem. See the black-screen guide if the device appears to be running.
Storage failure, damaged startup files, BIOS/UEFI changes, failed updates or memory problems can stop Windows from booting. A diagnostic should determine whether the problem is software, storage or another component.
Do not keep interrupting firmware recovery attempts. Failed firmware updates can require model-specific recovery or board-level work.
