Bricked phone during root process
China Phone and Locked bootloader? I don't think so... If it was locked bootloader and if you tried to flash some other kernal I think it's bricked (Permanently). And as you said you were in the process of Rooting your phone... That means I can say you had already unlocked bootloader... If the phone restarted and it got disconnected means the issue might be related (rarely) due to root process because you saying it's not showing up anything... It might be possible that your battery is low and also try some other key combinations and try to plug in you phone with some key pressed (Sometimes it's the process to unbrick the phone)...