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Are you using the original charger and original USB cable? If not, make sure your charger and USB cable meet the requirements in HoloLens 2 hardware | Microsoft Learn. And please refer to HoloLens Device Troubleshooting | Microsoft Learn for further troubleshooting.
Also, for future reference, the hololens-development tag is for questions about programming HoloLens apps. HoloLens device support is not currently available on Q&A. For questions about using or configuring your device please check out the documentation and support options at https://learn.microsoft.com/hololens .
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