For example if this is the now famous dv6000/9000/tx1000 line the answer is grim. But you didn't tell the model number.

The failure is well known so I won't write about that model line except in short replies (it's been done at length many times.)

Do try unplugging all the USB things and performing the GENERIC RESET (it's safe) noted in the Cnet Laptop Troubleshooting Forum.
Bob