Have you tried using a different USB port or cable? It's known that somethings especially front USB ports fail sometimes, especially when doing low-level stuff like installing the bootloader. Also, you might have a broken cable.
Please be more specific the next time, "doesn't work" isn't a question someone can be too helpful about -- without knowing details it's almost impossible to provide good answers. (Usual questions: how are you trying to install, which OS are you using, have you installed any other firmware on the player, etc.)