My 2007 Macbook Pro Santa Rosa just developed a problem where it failed to wake from sleep. I power cycled it, and it would not POST. I removed the battery and discharged the capacitors by holding down the power button, but laptop will not POST. The front light on the unit's latch powers on (steady light), there is a noise from the DVD drive as if it's checking for the presence of a disc, and a small amount of hard drive activity, but the display remains off.

It's been sitting on my desk for months. There's been no physical or liquid damage to it. I did notice prior to this that the DVD drive would occasionally check for DVD's for no reason (unit was sleeping, suddenly the DVD drive starts making noise), but I figured that had something to do with installing Mountain Lion about 2 months ago, since that's when I started noticing that issue.

What's the best way for me to diagnose the problem (motherboard, power supply, or something else)? I doubt it's worth getting it repaired by Apple, given the age of the unit, but if I can figure out what's broken I might swap out the offending part.

2 Answers 2


The mid 2007 MacBook Pros (MBPro 3,1) and the early 2008 models had defective NVidia GPUs that would cause failures similar to yours. The GPUs would fail at various times (6 months in for some, 3-4 years later for others). When that happened, Apple fixed them without charge.

If your MBPro still has its original NVidia GPU, then the problem could very well be that. Unfortunately, Apple's repair extension program for this program ended on Dec 7, 2012.

You might be able to find a replacement logic board on eBay or Craigslist.

  • excellent, figures it would end the month before the thing fails
    – jela
    Jan 23, 2013 at 13:22

I had this problem with a (currently 9-year-old) Late-2007 MacBook Pro, and found this answer (link below) solved the problem instantly. I never realized that identical-looking Apple AC adapters have different wattages. Look at the tiny print, and if it says "V = 16.5V, A = 3.65" then you are using the less-powerful MacBook adapter, instead of the more-powerful MacBook Pro adapter. If you have a more powerful adapter laying around, give it a try. If not, you may want to buy one.


  • In my case the problem did appear to be the GPU, which Apple paid to have replaced by a third-party provider (in 2013, for a 2007 unit).
    – jela
    Aug 5, 2016 at 13:42

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