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MacBook Air slow after waking from sleep

The backlight on my MacBook Air broke about a week ago and it fixed by Apple by them replacing the logic board. Since I've got it back I've had a couple of issues. Firstly, the machine wouldn't work ...
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Is it possible to switch from Safe Mode to Normal and back without a reboot?

Since 10.6.3, Apple has decided change the AppleIntelCPUManagement kexts, which leave me stuck with a kernel_task that pegs out at 135-185%, generating a lot of heat. Anyway, since I doubt anyone has ...