I have a 2008 Macbook Pro and my cat recently chew through that power cord. I bought a 85w adpater but I don't want to open it if I know it won't work.
Does an 85w work with a 2008 Macbook pro or should I exchange it for the 60w?
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According to Apple knowledge base entry HT2346 the 85W power adapter is the right one. However, there seem to be issue with "T" style (the old) vs. "L" style (the new): see this thread. It seems that for some people, a workaround does the trick:
Turn off your computer, flip over the laptop and remove the battery, hold down the circlular button on the battery for 10 seconds, the green light should go out. Re-install the battery and turn your computer on. Your new charger should work fine.
If that doesn't work, you need to call Apple support to arrange for your power adapter to be replaced with a "T" style adapter:
Apple is aware of the issue with the pins being at a different depth in the new chargers with the "L" shaped connection. After having two new ones not work, I contacted tech support. They sent a new version of the old charger with the square mag safe connector. It works fine.
Edit: Apparently the MacBook SMC Firmware Update 1.4 should fix the "L" style power adapter issue on older MacBooks.
Yes. All MacBook Pro 2008 Models can use an 85W Apple Magsafe power adapter.
This information is available from Mactracker, an app that catalogs details on every Apple product.
Mactracker is available for free from the Mac App Store and for download at: http://mactracker.ca/
I have no connection to the developers of Mactracker, it is just an indispensable tool that I have used for years to identify hardware details on non-current Mac models.
I hope this helps.