My computer was upgraded to win 10 pro 64-bit from win 7 pro using the media creation tool on a lenovo b40-30 laptop. I havent used it in two weeks. The power button lights up but nothing is on the screen. I dont think the hard drive light is on (the can symbol light.) Not even the bios shows up (the lenovo logo). Other than taking it back to the shop, please tell me how to fix it.