I have a Dell **bleep** 15-5577. NVDIA GPU does not work in a few weeks. I tried to write a new version BIOS, tried a new operating system (windows 10 update 1511; 8.1; 7), tried all NVIDIA drivers (381.65 - 390.65). Still did not work. İn the Device Manager device status "windows has stopped device because it has reported problems"
It sounds like a hardware problem. You will need to contact Dell Technical support and probably send the laptop in for repair.