08-24-2019 01:42 PM
Sorry to hear about the trouble. Try to remove the SD card from your camera and attempt to reset camera by holding the top SHUTTER button down for 8-10 seconds. If successful, the camera will beep 3 times and advise you that the unit has no SD card and power off. Normal operation should ensue after reset.
If the issue persists, please try the troubleshooting suggestions here: HERO Session / HERO4 Session Will Not Power On
Let us know how it works for you.