MacBook late 2009 vs MacBook Pro Mid 2012 (Ram)

Hi, I recently upgraded the Ram in my MacBook Pro (Mid 2012) to 16gb 1600 MHz DDR3 and my wife's MacBook (late 2009) has 2gb 1067 MHz DDR3 currently in it, but I tried using my old Ram (2gb slots) from the Mid 2012 MacBook Pro, and her MacBook wouldn't boot up at all, I just got a black screen.
So I see the difference is the 1600 MHz vs the 1067 MHz, so does that mean that my old Ram won't work because of this?
Thanks in advance,
DJ Meezy

Meezy81 wrote:
So I see the difference is the 1600 MHz vs the 1067 MHz, so does that mean that my old Ram won't work because of this?
yes, that is why.

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Thanks for using Apple Support Communities.
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http://support.apple.com/kb/HT1573
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