For example, if your Mac starts up from a disk other than the one selected in Startup Disk preferences, or a question mark icon briefly appears before your Mac starts up, you might need to reset NVRAM. You can release the keys after about 20 seconds, during which your Mac might appear to restart.
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- PRAM-Reset oder SMC-Reset am Mac durchführen.
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When your Mac finishes starting up, you might want to open System Preferences and adjust any settings that were reset, such as sound volume, display resolution, startup disk selection, or time zone. Learn more If you're using a desktop Mac instead of a notebook, and settings such as sound volume or time zone are reset every time you shut down and unplug your Mac, you might need to replace the battery inside your Mac.
You can take your Mac to an Apple service provider to replace the battery. To black.
Help much appreciated as travelling. Kirsty The only light i have on the machine are the small power lights on the left side. Other than that it is dead for no reason as i shut down as normal. Guys I never reply to any help sites but this one here up is a bummer!! Saved my new mac which I thought damaged! Thanks a lot guys. Saved my day. Is it possible its battery had problem? Because its work about hours. I have a Bluetooth keyboard which lags on the reboot. Is there any other way to reset the PRAM?
Yes, finally something that worked! Thank you!!!
Zapping the PRAM
Been having trouble with wifi-connection on my MBP after installing to Maverick kept falling out. Been trying a lot of things, but this was the only thing working for me. So happy now. I just upgraded my memory from 4 GB to 8 GB on my macbook pro. Someone had suggested this though before I do it want to make sure. Actually — if you continue to hold down the key combo and let the mac continue to reboot — it will reset other parts of the mac. At least, that is how it used to be.
Seems like an odd collection of data that is stored within this PRAM, but good to know if things go a bit haywire. What next? In certain […].
How to reset your Mac's NVRAM, PRAM, and SMC
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How and when to reset your Mac’s PRAM and SMC – Gigaom
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When Should You Reset SMC?
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