Have you tried downloading the driver from the Dell Site? Or used the driver from the DVD the laptop brings?
Alienware 13 - i5-4210U - 16 GB MEM - 512 GB SSD - 2 GB NVIDIA GeForce GTX 860M
i think is the sound system problem i plug in the a/c there is no sound but when i take out there is sound. I had bring it down to the respective store for one for one exchange, they agreed to change for me.