Default [Q] usb

Hi
i have installed xperia rom on Samsung galaxy s3 i9300 and it works so good except one thing
when i want plug my phone cable to the laptop . the laptop doesnt feel the phone at all or show me the mass storage , i tried to active
delevoper option and usb debugging it is same . Although when i restore my phone to original belly jea,, it works my usb very well

i like this rom xperia but i dont know how i should fix this