I have a 3g iPhone, when I plug it into my PC it shuts it down. I have moved my PC to another part of the room and since then I haven't been able to plug it in. I have checked that all the cords are in the same place as before and they are.
Check your Cables and Connections
I don't think that your iPhone issue is related to moving your computer. It sounds more like an operating system or software compatibility problem, but a great place to start it by triple checking your computer cables and connections and make sure that the power source is stable. You should also check the USB port that you are plugging the iPhone into by connecting a different device and making sure that it works properly. Since iPhones sync with other Mac products, make sure that you have the latest version of iTunes, if you use it.
Change the Drive Assignment
The iPhone can cause problems for some operating system, including Windows XP because the operating system recognizes the device but can't communicate with it properly. Some users report success after changing the drive letters. I'm not sure why, but this seems to help the computer with the device.
- Click Start, choose Control Panel, and then Performance and Maintenance
- Choose Administrative Tools, then click twice to open Computer Management
- On the left side, select Disk Management
- Right click the drive you want to change, then click Change Drive Letter and Paths
- Click Change, then click to select Assign the Following Drive Letter
- Choose the drive letter that you want to use, then OK
- Choose Yes to confirm the change
- Try the iPhone again
Update or Disable Webcam Software
If this doesn't work, there is another fix you can try. If your computer is equipped with a built in webcam, it could be conflicting with the iPhone. The first step is to go to the website for the manufacturer of the camera you have and look for new drivers. Also, it's sometimes installed rather than built in camera software that is messing with the Windows operating system, so look for any camera or webcam software you have installed in All Programs search for updates. If this doesn't work, the next step is to try disabling your built in camera, or removing the added software, and removing the corresponding registry entries.
Get a Powered USB Hub
The only other thing that comes to mind is the power supply. Some users report computers crashing when an iPhone is connected if there isn't enough power going to the system. In this case, the computer shuts down to protect itself. The fix for this is simple enough, but will cost about 5 dollars. All you need is to get a powered USB hub - one with an external power supply so that it isn't taxing the computer - to connect between the computer and the iPhone and you should be in business.