As you have mentioned that you have formatted the unit and then connected it to pc.
So first of all check the basic things.
1) Remove the usb wire completely.And check if any dust in the wires or the usb wire is got cut in between.If no such symptom continue next
2) In your pc there are two usb slots in some there are 4 usb slots.So try connecting the wire in other usb slot then check.If same problem continue next
3) If you have any other usb wire which you have confirmation that it is working then try it with that usb wire.If you dont have wire then get new usb wire.The usb wires are not very costly.You can get it from local computer hardware parts store.If same problem with other wire too continue next
4) Check out the usb slot where you are connecting the usb wire in your pc if its got loose or moved then it will not detect the device connected to it.So press the usb wire in the slot with your hand bit tight and wiggle the wire in the slot then check keeping the wire pressed in the slot.
If same problem continue next
5) Then it clears then problem is not with usb wire or its connection.It can be driver problem as its showing unknown device.
When you view device information in Device Manager, you may see a device listed as Unknown Device next to a yellow question mark. It may be difficult to determine the cause of this unknown device, because there are few indications of what generates it.
The main reason for Unknown Device to display in your Device Manager is because you have a device that is not working correctly. To fix this issue, obtain an updated driver for the device.
The device does not have a device driver: When a device driver for a device is not available, Device Manager displays the device as Unknown Device and puts it in theOther devices branch. This is very common with universal serial bus (USB)
Click this link below to get more help:--
http://support.microsoft.com/kb/314464
Thanks. Keep updated for any more query. You can rate this
solution and show your appreciation.
189 views
Usually answered in minutes!
×