My Toshiba laptop fell to the floor and rebooted at first it was running fine until it rebooted again it start saying reboot and select proper boot device... I've tried reinstalling windows 8.1 from a boot able flash drive but keep getting an error that says missing drive partition I checked the bios and it detected the HDD so I tried resetting it and got the same error that says missing drive partition... It would be really awesome if someone could help me out