If you haven't done so yet, power off the computer. Remove all peripherals such as speakers, external portable drive or flash drive, wait a few minutes, power on computer, hopefully Bluetooth, USB and camera are working again.
If devices still don't work, run Dell Offline Diagnostic tool to check Hardware within the computer.
Just follow the steps below:
1. Power off computer.
2. Power on computer, quickly start tapping F12 continuously until you seePreparing One Time Boot Menuin top right corner of screen. In Dell Preboot menu, selectDiagnostic. Report back any error code.