I bought an used satelite l850. It came with damaged gpu amd 7670m . It was an i7. Since it has intel gpu 4000 intergrated i managed to disable amd and use my laptop only with intel gpu. Then one day i sent in a repair shop .. he reballed the gpu and motherboard completely failed. I have black screen . If i sent to another service can they bring bck to life . At least as it was with only intel gpu ?? Plz answerr