It may be that one of your 4 GB SO-DIMMs is of marginal quality and is failing during one of the training steps.Now let’s consider a couple of possibilities: According to Apple, the mid-2009 MacBook Pro does support up to 8 GB:ĤGB (two 2GB SO-DIMMs) of 1066MHz DDR3 memory two SO-DIMM slots support up to 8GB Let’s consider the most common.įirst, let’s make sure your system supports 8 GB. 3 beeps + 5s pause means your memory failed training.
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