USB is not detecting by my Computer what’s wrong?

Fix For Mobile (Mass Media/Storage Mode):

• First Check out Your sd card  no password on your Card
• Use Pc suite mode (for fixing this problem)

• Now
• Goto Device Manager
• Disable that Installed Driver Now again Enable it
• Now Restart Your Phone And Pc.
• Connect our mobile to USB’s port
• Now it prompt n installation proceed

Fix For USB Not Recognized:

• Firstly Check whether Your USB port is Disabled by System or not.
• Now Follow this Steps

• Goto  Device Manager

or

• Start
• RUN 
  type Devmgmt.msc 
• Now you have to search for
  USB Controller Hub or Universal Serial Bus controllers
• Now click Properties.
• Now Click on Power Management tab
• >Allow the computer to turn off this device to save power >click OK.
• Now Hit
  > Scan for hardware changes.
  >Now it Start Detecting New Drivers for USB.

Note:
If your Cable or Device is not Still Detected then You Have to First Troubleshoot it after Connecting it to Computer.
or Try to attach that Device with New Cable or USB.