Could you send us a private message here with your full model code and serial/IMEI number of the device?
@userhwqHj4wiXa have you tried any of the troubleshooting steps mentioned previously in this thread?
I'm sorry to hear your Gear S3 is not powering on. These troubleshooting steps may help resolve the issue. Click on the word Link to access the full article. Let me know if this helps.