Hey, @wch32094.
Check to make sure that all connectors are in place, especially those connecting the board to the HDD and fan. Also ensure that the two boards (Bluetooth and Wifi) that lie on the outer side of the internal metal shell are fully connected and screwed in. If you follow that process and don't reach a solution, then it is likely a data corruption issue with your HDD, which means a necessary replacement.
***Pages of Interest:***
[guide|90209|Xbox One S HDD Replacement Guide|new_window=true]
[product|IF373-000|Xbox One S HDD Replacement|new_window=true]
Good Luck.