My mac often doesn't respond after sleep mode. What can be the reason?
There are a lot of articles about what to do in this situation. But I can find nothing about how to Prevent it.
Mac is macbook Air. OS is OSx 10.7.4
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Looks like I fixed it. The problem was, that I divided my disk onto three logical disks. And system was confused, which one to be used for booting. When I chose Startup Disk in System preferences (even though there was only one option) the laptop wakes up normally. (I had no problems during three days)