hey guys i need a bit of help, i have a HP pavillion G6 which i bought from a computer store (currys/PCworld) about 3 years it came stock with windows 8 then i upgraded it to 8.1 and now recently i upgraded it to windows 10 and it worked great, then i reset the pc so all my files would be deleted so i can sell it on as i no longer need it but now when i turn it on i get a message that says INACCESSIBLE BOOT DRIVE, and from my past experience with rooting phones i am guessing this is bricked so how can i unbrick the device? any help would be very greatly appreciated.