Can you share with us, please, what implied the tapping of the F2 key and going to the BIOS menu? Did you have a booting problem with the hard drive? If you didn't, please tell me what other error did you get. The reason you are unable to boot is that the hard drive is not set as a first boot priority device. It also may be due to misconfiguration in the BIOS settings, physical disconnection of the drive or even its failure. These are the thing you might want to check.
My advice is to restart your PC, press the F2 key and go to the Boot menu. Do you see your hard drive listed there as first priority boot device? If the mark is not set on it, please set it manually. Then press F10 to save the changes and restart.
Let me know if that helped you. Have a great weekend.