Help!! I tired upgrading my macbook ram and now it won't boot

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I have a MacBook 2009 core 2 duo 2.4 ghz with 2 gb ram. I tried to upgrade to 4 gb, 2-2 gb sticks. I used cent on macready DDR2 800/667/533 ram. I thought this was the right ram. When I upgraded the system wouldn't boot. It will boot with old ram or with one new stick and one old stick giving me 3 gb of ram. I don't understand everything says I can upgrade to 4 gb, even some say 6 gbs. Please help. I bought a package and I cut it open, this will be a pain to return. :(
 

chscag

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Are you sure this is a 2009 model? The 2.4 GHz Core 2 Duo sounds more like a late 2008 model MacBook with an aluminum unibody. The 2009 models did not come with a Core 2 Duo 2.4 GHz processor.

If it is a late 2008 model as I described above then the memory should be:

2 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM

And according to Mactracker that machine can take up to 8 GB of memory.
 
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I looked into it more and I think I have a generation 5 white 2.4 ghz 2008 model. It is definitely white 13' 2.4 core 2 duo. And I think we got it in 2008 around October/ November.
 
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The "about system" says I have ddr2 667. And the 200 pin 2gb stick fits in because right now my system has 3 gb rams up and running. One old stick one new one. I don't know why it won't work with both new sticks.
 
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The "about system" says I have ddr2 667. And the 200 pin 2gb stick fits in because right now my system has 3 gb rams up and running. One old stick one new one. I don't know why it won't work with both new sticks.

You may have gotten a defective Ram stick. It happens, you might just have to take it back and explain how it doesn't work. :p
 
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MacBook Pro 2011 2.4GHZ 4GB Ram 500GB HD
If you go to crucial.com they can run a free scan and tell you just what you need and you wont have any problems:)
 
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You may have gotten a defective Ram stick. It happens, you might just have to take it back and explain how it doesn't work. :p

What he said... You buy enough RAM over time and you will end up getting a dead stick.
 

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