I checked the Bios and enabled "external USB devices" under system configuration and now it is working!
On my Vostro 5490  recently all my USB ports (one USB 2.0, two USB 3.x and one USB C) stopped working. I have tried to disable/enable and uninstalling the USB devices in the Device Manager but did not help. I also tried to update the bios and chipset drivers but did not help either. I only have three device under USB controllers in the device manager (Intel USB 3.1 eXtensible Host Controller, USB Composite Device and USB Root Hub). I tried to restart in safe mode but no change. I can charge the PC with the USB C and also charge other devices by using the USB ports of the PC, the devices connected are however not recognizable. Any suggestions what I can do?  
All USB ports stopped working for vostro 5490