macbook stopped charging iphone

i have had my macbook for 3 month now and have been charging my iphone from it via the usb.

for no apparent reason it has suddenly stopped charging my iphone!!!!

the iphone will charge from a normal mains charger, any ideas why this could have happened ?

Try a new cable and different usb port.

My dad had the same problem with his iMac, and 1st Gen iPhone.
We got out the old usb cord and it worked good as new!

Solution

OS X 10.4.11
iPhone 3gs 32gig (3 days old)
Macbook Pro 2.16 Ghz Intel Core 2 Duo

Issue:
- out of the blue my MBP stopped chargeing my iPhone using the usb cable. No sync to itunes either
- using usb cable can charge from another pc and wall plug adapter is ok
- usb drive works on usb port on MBP

Did a bit of digging and managed to solve this.

iTunes and usbmuxd:
This is a bit of software (also called a daemon in UNIX terms) that runs on Mac OS X (a flavour of UNIX) to sync iTunes with your iPhone and can be found here

/System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/Resources/usbmuxd

Solution (for me):
- Go into your settings then into System > Accounts
- under your account select 'Log in Items'
- tick the checkbox next to iTunes
- Shut down MBP and remove the battery and power adaptor
- Reconnect battery and power adaptor to MBP and reboot
- reconnect your iphone

iTunes should load automatically and the iPhone charge from the usb port and resync again. It did for me.

I think it has something to do with the system starting the OS and iTunes at the same time (which in turn starts up the usbmuxd deamon) causes a problem. Starting the system first and then iTunes once the system is all started seems to resolve the issue.

Hope this helps.

D