Default [Q] usb device not recognized

I have problem with my nexus, This error shows up few days ago when i tried to plug my phone to computer. So i can't transfer data, and what is more i can't change rom to stock 4.4.3. And now what I've tried to do.
- I checked a few cables
- on other computers
- tried to use fastboot on linux and phone display showed download and nothing happend
- I think that the usb works because i tried to do the backup by adb and succeeded (pull).
Any one already had a similar problem?