M Audio Fast Track Solo suddenly not recognized

Hi I'm using m audio fast track solo for like 5 years and everything was working fine until one morning suddenly it stopped working.When i looked the device manager it says that unknown device and cant find any drivers or any information about it.I downloaded newest drivers and it says not connected.Im using Win 8.1 it was working with win8.1 before and i tried with a different cable and with my other pc.All the lights on the front working(48vpahtom power,blue power light etc) when i plug my guitar and play the signal light is working too.with direct monitor on i can hear the output coming from my speakers i think everything just works fine but pc cant recognize the device