Hello David,

> On 8 Sep 2016, at 11:34 AM, David Noel <[email protected]> wrote:
> 
> HELP! I shut down my iMac and now the power switch on the back doesn't
> bring it back up -- what can I do?????

> David Noel
> 
> (writing this on my wife's MacBook pro).

How to fix a Mac that won't start up: Step 1 - Check your Mac turns on
First, let's check that the problem is that your Mac won't start up, and not 
that it won't turn on - those might sound like the same thing, but there's 
actually a big difference.
Press the Power button on your Mac. If you don't hear a start-up chime, you 
don't hear any fan or drive noise, and there are no images, video or visuals of 
any sort on your display, then your Mac isn't turning on at all. You're not 
even getting to the point where it refuses to start up.

A Mac that doesn't turn on calls for a different approach to one that doesn't 
start up. If your computer doesn't turn on then take a look at this My Computer 
Won't Turn On <http://support.apple.com/en-us/TS1367> support document from 
Apple. Apple suggests that you:
Check the connection to the power.
Try a different power cord or adaptor (if you have one).
Disconnect all accessories (such as printers and USB hubs).
If you recently installed new memory or a new hard drive, make sure they are 
correctly installed and compatible (if possible re-install the old memory or 
hard drive).

If none of these steps resolve the problem, then you should attempt to reset 
the SMC  <https://support.apple.com/en-us/HT201295>(System Management 
Controller)
If inline link doesn’t work here is complete link to SMC reset:
<https://support.apple.com/en-us/HT201295 
<https://support.apple.com/en-us/HT201295>>

Cheers,
Ronni

13-inch MacBook Air (April 2014)
1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
8GB 1600MHz LPDDR3 SDRAM
512GB PCIe-based Flash Storage

El Capitan OS X 10.11.6


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