[Q] USB Automatically Disconnecting after two sec. topic

I am not able to connect my phone to my pc using data cable neither in Download mode nor in Power on.
The problem is that USB disconnecting automatically after two sec, and windows was unable to recognize it.
I tried connecting Another phone using the same data cable and pc, it worked fine, it was GTS 5830i.
is there any way to solve this issue?
please help me.