Why can't my PC detect my iPhone?

My iPhone can't get detected with iTunes or anything? I have AppleMobileDevice and iPodServuce running but my iPhone 4 still doesn't get detected in Windows 7.

I tried everything listed in Apple website.

The cable works because the iPhone gets detected on my Mac and my other laptop.

Maybe the USB port on your PC is defected. Try cleaning the port or even blow on it to clear dust or dirt or even try restarting your PC
That's all I can think of

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