My PC doesn't see my iphone?

So i have USB and try to connect my iphone ( 1st generation ) to PC, it was connecting fine but now it won't even see my iphone what do I do? :/

1. Ensure iPhone is charged and turned on
2. Try all usb ports
3. Try different cable
4. Restart your computer
5. Try on different computer
6. Try different iOS device.

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