Will a 40 watt charger Power a MacBook?

Discussion in 'MacBook' started by Joshhfatzick, Mar 13, 2012.

  1. Joshhfatzick macrumors newbie

    Mar 13, 2012
    So I bought a used MacBook yesterday and the guy gave me the power adapter for his MacBook air, he said it would be the same, and I didn't know any better.. I accidentally let the battery run out last night and now it won't turn on even though it's plugged in and the light on the charger is green. The computer worked fine last night, and the guy at the apple store said everything was fine with the computer yesterday.the guy at the apple store said you're not really supposed to use a 40 watt with a regular macbook(its a late 2007 black model) but the kid I bought it from said that's all hes ever used. Anyone know what's up?
  2. simsaladimbamba

    Nov 28, 2010
    Yes, it would charge it, just slower, as a MacBook has a 60 W power adapter.


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  3. logana macrumors 65816


    Feb 4, 2006
    The 45W Air Magsafe should charge the battery if the computer is not on....

    If the MacBook is off and the Magsafe light is green then it is not charging - maybe you have a bigger problem than you think.......

    The Magsafe will power the MacBook but it won't really charge the battery at the same time
  4. iDutchman macrumors 6502a

    May 9, 2010
    Amsterdam, NL
    It will power the machine but by no means charge the battery. It's like using it without a battery..

    Experience ;)

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