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Hi,
My Mac just randomly shut down yesterday while I was using it and now it won't turn on. I left it unplugged over night and it still won't turn on. Tried resetting the smu and it still won't work. Can someone help??
Thanks.
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Unplug it, press and hold the power button for 10 seconds. Plug it back in and give it a try.
UPDATE 7/2016
This fix is called an SMC reset. Useful when you have one or more of these issues"
Indicators that your SMC might need to be reset
After you perform normal troubleshooting, these symptoms may indicate that an SMC reset could be necessary:
The computer fans run at high speed, though the computer is not experiencing heavy usage and is properly ventilated.
The keyboard backlight behaves incorrectly on Mac computers that have this feature.
The status indicator light (SIL) behaves incorrectly on Mac computers that have this feature.
Battery indicator lights, if present, behave incorrectly on Mac notebooks that have a non-removable battery.
The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature.
The computer doesn't respond to the power button when pressed.
A Mac notebook computer doesn't respond properly when you close or open the lid.
The computer sleeps or shuts down unexpectedly.
The battery doesn't charge properly.
The MagSafe power adapter LED doesn't indicate the correct activity.
The computer is performing unusually slowly, though it isn't experiencing abnormally high CPU utilization.
Application icons may bounce in the Dock for an extended amount of time when opened.
Applications may not function correctly, or they may stop responding after being opened.
A computer that supports target display mode does not switch into or out of target display mode as expected, or it switches into or out of target display mode at unexpected times.
The illumination around the I/O ports on a Mac Pro (Late 2013) does not activate when you move the computer.
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Does this also work with a mid 2010 21.5?
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I was working on the computer a 24"2.8GHZ Model A1225 EMC no: 2211. I held the start button down for ten seconds after unplugging the power cord. I then plugged it back in and no . Absolutely nothing. I then found a similar power cord on Samsung TV and used that to plug in the A1225. That also did not work. I then tried a new power source (wall plug testing that with a working lamp first. Absolutely no power, no start up noises nothing. Any other thoughts . I have an appointment with the Apple Store in 4 days but would like to resolve this myself.
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