Model A1181 / 1.83, 2, 2.1, 2.13, 2.16, 2.2, or 2.4 GHz Core 2 Duo processor

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MacBook reboots after waking from sleep mode

MacBook Core 2 Duo; 1.83 MHz; 2.256GB RAM; OS 10.6.3

Problem:

MacBook goes into restart after going into sleep mode. It does not appear to be an operating system problem since the problem occurs when started from an external disk and independent OS. PRAM and SMC resets have not helped. Operating from battery or power adapter results in same behavior. No other problems are apparent during operations.

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I think it might be a combination of problems but for the moment it is working. I switched out the RAM and put two 512MB sticks in. I also installed a different battery and HD with a different OS. It appears to be working without the sleep problem. The other MacBook from which I obtained parts works fine with the parts from the first MacBook. The only thing I did differently is not add the second 256MB stick to the donor Mac. It only got the 2GB stick from the original problem Mac.

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You need to troubleshoot the MacBook to know if the logic board is failing. I would remove the top case and disconnect everything I could: optical drive, airport card, fan, remove the 2 sticks ram and try each stick individually in the other ram slot. I will also try to boot the MB without the top case, there are two small solder pads on the logic board. You can trip them to power up the machine, there's a power icon over the two pads and they're located near the fan. The battery connector/sleep sensor could also be the culprit.

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I'd try a OS reinstall. If that doesn't fixes it it's most probably a hardware fault. In that case it's maybe better to do without the sleep mode.

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