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A possible solution to a wake from sleep problem
Authored by: ipearx on Aug 16, '05 06:02:17PM
My 17" PowerBook had the "blank screen, frozen, but with caps lock and num lock lights still working" type freezing.

Here are some of the solutions I have found on the net:
1) reset pram and nvram (this seemed to help for a while, but the problem would always come back, especially after system updates)
2) reset turn off wireless before sleeping (I found this worked for a bit, and I could reliably wake from sleep without it on, and reliably freeze when wireless was on)
3) turn on/off bluetooth and change "allow bluetooth to wake" settings
4) reset the energy saver preferences
5) change the "go to sleep settings" to never, and only sleep manually
6) only put the computer to sleep with the apple menu (or power button panel) and don't simply close the lid (this also seemed to work for me for a bit)

My freezes were only occasional (once every three days), sometimes more often than that. What I noticed is it started getting more and more frequent, and I also started getting other freezes happening.

The problem? Bad RAM - I bought a cheap 1GB chip from Other World Computing. I took it out, all problems went away. Sent it back, got a replacement. Haven't had an issue since.

BTW, OWC were really great. Only 10 days to replace the bad chip from New Zealand. All the other RAM I have had from there (3 chips) has been fine.

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A possible solution to a wake from sleep problem
Authored by: bdog on Aug 16, '05 10:21:46PM

Very good list of troubleshooting steps, however you missed a big one. Reset PMU. Since we are talking about sleep, PMU could have a big impact...

I've never had issues with sleep since I started using OS X (X.2 days). Of course OS 9 was horrible with sleep/wakup. OS X's sleep is rock solid, for me at least. I've had my computer crashed, but it would still sleep and wake. (closing lid, as any clicking didn't happen as it was crashed)



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