USB not working on nexus s - Android Software/Hacking General [Developers Only]

hello
i have nexus s phones ( I9023 GRI54) with everything stock yesterday when i was trying to install it's drivers i got a sudden stop in the usb function of the device , this stop was like this
*device doesn't show that the device is connected to the pc (in the notification area "USB CONNECTED OR USB DEBUGGING ON)
*not connected even in boot loader mode
*Odin 1.82 couldn't find the device at all.
NOTE: In all cases the PC (win 7) shows USB not responding and unknown device.
IMPORTANT : When i tried to connect my brothers nexus s (I9020 GRH78)to my PC everything was ok (adb , bootloader , mass storage modes.
PLEASE HELP
THANK YOU​

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