Some Apple computers have an auto-switching power supply, which monitors the incoming voltage and automatically switches itself accordingly. Other Apple computers have a power supply that must be manually switched for various incoming voltages. The change is made by moving the voltage selector switch, which is accessible from outside the computer's case. Still other Apple computers have a power supply that is rated only for the country in which it is sold, and is not switchable to other voltages.
The table below shows what type of power supply is in various recent Macintosh models. Some models can use the World Travel Adapter Kit. If your computer cannot use the World Travel Adapter Kit and you need a power adapter or power cord with an appropriate plug, contact an AASP in the region.
iMac (Early 2006) Auto-Switching
iMac G5 (iSight) Auto-Switching
iMac G5 (Ambient Light Sensor) Auto-Switching
iMac G5 - all models Auto-Switching EXCEPT models sold in the US, Canada, and Japan (these models support 100-127 V AC)
Don't know whether your Canadian model falls under this... it might be referring to Rev A machines, which are NOT auto-switching.
Miriam
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.
