Reply to Midi-Fighter Problem.....PLEASE HELP!

I plugged my midi-fighter into my laptop and all the LEDs stayed on. It doesn't let me go into bootloader by pressing the 4 corners and the midi-fighter isnt being found on my computer even when i open up traktor. I dont get whats wrong when just the other day I was using it perfectly fine without a problem.

What am i suppose to do to fix this problem???????