Apple 24-inch mid 2007 Benutzerhandbuch

iMac (24-inch Mid 2007) Take Apart — Symptom Charts 

A USB device doesn’t work.

Please unplug all of your USB devices from your iMac except your Apple Keyboard and Apple 

1. 

mouse.

Now plug your device directly into the back of your iMac. Does it work as expected now? 

2. 

 
Yes: Your device works when plugged directly into the computer. This indicates a conflict 
with one of the other USB devices. You can test by gradually adding your devices back 
and seeing where the issue occurs, then contacting the manufacturer of the device(s)) for 
assistance. 
 
No: Unplug your device from the iMac and plug the keyboard into the port your device just 
occupied. Is your keyboard still working? 
 

Yes: Your Apple Keyboard works when plugged into the USB port your device was 

plugged into. This points to an issue with your device. Please review the documentation that 
came with your device. Install any necessary drivers and contact the manufacturer of your 
device for assistance. 
 

No: Replace the logic board

I see a message saying not enough power to function.

It appears that this device needs to be plugged into the computer’s USB port, rather than the 
keyboard USB port. Any USB device connected to the keyboard needs to be either a self-powered 
device (a USB device with its own AC power supply), or a low-power device (a device that does 
not need a large amount of voltage to operate). Your device may draw more power than the 
keyboard can provide.