"Unknown Device" shown when I connect my iPhone 4 to the laptop
Hi all,
My iPhone 4 cannot synchronize to my Windows 7. Only "Unknown Device" shown on the "Device Manager" when I connect them via the cable.
The laptop is new and installed Windows 7 Home Premium Edition 64-bit. BIOS is the latest one.
iOS is 4.0 and iTunes is 10.0.1 for 64-bits Windows 7
I do not think the problem is due to the iTunes. Only "Unknown Device" shown on Window 7. I think the iPhone cannot be recognized by the laptop.I tried to connect the phone to a Window XP. It is fine. Likewise, a usb drive is recognize by the Windows 7 laptop.
I have tried
1. update the BIOs
2. Re-install the itunes
3. download the usbaapl.sys
Can anyone help as it bother me for a week.
Thanks very much
Ben
The first thing I would try is to use a different USB port
next I would have my MacbookAir looked at
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Thanks for visiting Apple Support Communities.
I'd suggest using the steps in this article to isolate and resolve the issue you're seeing:
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