Shut down with usb connected

[Andres Felipe Acosta Gil]

Hey all, i shut down my computer with a usb memory connectad, then i
disconnected it when the computer was turned down, when i turned on the
computer, a black screen appears and a prompt (i cant type anithing), and
fedora or windows doesn't boot. What should i do??, i alreday choosed all
the options in the boot menu.

Andres Acosta