2008 macbook shutting down with 8gb ram

i have a 2008 MacBook, A1278, running Mountain Lion, 10.8.2. I am trying to upgrade to 8GB RAM, in order to run xcode properly and it is shutting down on me after 1-2 minutes of use. I do have the newest boot ROM version. I just bought a new logic board for it. The hard drive was taken out of another computer (MacBook Pro, 2007), with Mountain Lion already installed. Could that be a problem?
When I remove the 8GB ram and put in the 4GB (which the 2007 Mac had), everything works fine.
I know Apple only supports 4GB but i've been reading that w/the latest firmware update, I should be able to use 8GB.
Thank you!

Upond2 wrote:
... The hard drive was taken out of another computer (MacBook Pro, 2007), with Mountain Lion already installed. Could that be a problem?
Memory from your 2007 MacBook Pro probably operates at 667 MHz and is DDR2. The 2008 MacBook's bus operates at 1066 MHz and is DDR3. Memory from the 2007 MacBook Pro should not work at all in your MacBook.
I think your problem is incompatible memory but swapping hard disks from one computer to another could also cause problems. Fix the memory problem, but you should reinstall Mountain Lion, ensuring the hardware drivers it contains are correct for your MacBook. Boot OS X Recovery and install it.

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Message was edited by: incomethax

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