I have a XPS 15 9550 and it wont recognise any SD card reader. The internel SD card reader won't show up in device manager and if I connect an other SD card reader via USB-C it won't show up either. I have verfied, that the SD card and the external SD card reader work on a different Windows laptop. If I connect the camera with the SD card inside it shows the camera in device manager but the SD card still doesn't show up. I have updated everything and reinstalled the Realtek SD Card reader drivers but nothing has helped so far. Does anybody have any idea what else I could try apart from reinstalling windows?