hey guys im getting a prob with my windows 8.1 when i enable fast startup, and i shutdown my pc. the next time i turn the pc on, it shutdown after the bios without booting windows. if i disable fast startup, the pc turns on normally and boot windows. didn't have this prob in windows 8 before, its only now that i noticed that, i thought i had a power supply prob but its not the case. i have an intel core i5 2500 and 8gb ram.