MacBook RAM Issues

I'm having a strange issue with my MacBook (13-inch, Aluminum, Late 2008). The machine will only boot when there is only RAM module installed. When both modules are installed, it does not turn on. I have tried flip-flopping which socket each module is installed in, and I've also tried every combination involving just one module, installing each module in each socket one at a time. I've been able to determine that both modules and both sockets are functional, but for some reason, things don't work when both sockets are filled.

Any help would be appreciated! Here are my specifics:

Hardware Overview:

  Model Name: MacBook

  Model Identifier: MacBook5,1

  Processor Name: Intel Core 2 Duo

  Processor Speed: 2.4 GHz

  Number of Processors: 1

  Total Number of Cores: 2

  L2 Cache: 3 MB

  Memory: 4 GB

  Boot ROM Version: MB51.007D.B00

  SMC Version (system): 1.40f2

  Serial Number (system): W89186YF8QT

  Hardware UUID: 6C9D1E70-FD28-5774-8199-FC0CEF53B77B

  Sudden Motion Sensor:

  State: Enabled

Both RAM modules I have are Crucial 4GB DDR3L – 1066 SODIMM MAC

Thanks in advance!

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