When i try to plug my iphone in via a usb it constantly just disconnects and reconnects the phone for about 5 minutes before it'll actually work, so my phone will constantly vibrate for that time. And when it finally does connect it might just suddenly start doing the same thing again. I thought it was a problem with the usb port, but other usbs seem to work fine, and its not a problem with my iphone because it did the same thing to my ipod. It's a new laptop, and it's been doing it for as long as i've had it.