To fix the problem, try the following solutions:
- Disconnect the USB cable and connect it again.
- If you use a USB hub, try connecting the phone directly to the computer.
- Check the USB cable for problems and replace if necessary.
- If your phone asks you for the connection mode that you want to use, make sure that you select Nokia Suite (or PC Suite) on your phone.
- Disconnect the cable, restart the computer, reboot the phone and try again.
Keep in mind that if you remove USB devices without using the Safely Remove Hardware tool in the Windows taskbar, connection problems may appear.
Also, if your connection suddenly stops working, you can try to repair it in the following way:
- Go to Add/Remove Programs in Control Panel (called Programs and Features in Microsoft Windows 7).
- Select Nokia Suite in the list of applications and click Change/Remove.
- In the dialog that appears, choose Repair. Nokia Suite then checks that all the needed files are intact and repairs any errors that were found.
- Then do the same with Nokia Connectivity cable driver, right click and Change/Repair.
- And finally, in Control Panel, Select Devices and Printers, and then remove your device profiles and reinstall them.