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I just downloaded and installed a software update, now my

Customer Question
I just downloaded and installed...
I just downloaded and installed a software update, now my MacBook Air will not turn on or respond at all, what should I do?
JA: Just to clarify, how old is your MacBook Air and what operating system are you running?
Customer: My mac book is approx, 3 years old , I am not sure what operating system, but I have faithfully downloaded all updates
JA: Have you installed any updates recently?
Customer: Yes. This seems to be the problem
JA: What troubleshooting have you tried?
Customer: none,,, the computer will not respond at all
JA: Anything else you want the Mac expert to know before I connect you?
Customer: No
Submitted: 10 months ago.Category: Mac
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Answered in 10 minutes by:
1/1/2017
Mac Support Specialist: Mike, Mac Medic replied 10 months ago
Mike
Mike, Mac Medic
Category: Mac
Satisfied Customers: 8,997
Experience: Over 20 years IT experience with Apple computers in publishing, marketing and design.
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Hi, welcome to justanswer.com! My name is Mike.

I am going over your question and I will be with you shortly.

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Mac Support Specialist: Mike, Mac Medic replied 10 months ago

Hold the power button for 10 seconds to shut it down, then:

2. Plug in the power adapter to a power source, connecting it to the Mac if its not already connected.

3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time, if it starts up you held the power button before the other keys, try again.

4. Release all the keys and the power button at the same time.

5. Press the power button to turn on the computer.

6. Press and hold the Command-Option-P-R keys before the gray screen appears. (You have to do it pretty fast if you miss it just shut down by holding the power button for 10 seconds then start it up and continue with step 6).

7. Hold the keys down until the computer restarts again at least twice.

8. Release the keys and immediately hold the Shift key until you see the Apple logo. This will activate Safe boot and it will check the drive for errors among other things. It may take longer to boot and you may see a progress bar during part of the process. If it starts up OK, login then restart the normal way from the Apple Menu. Let me know after.

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Mac Support Specialist: Mike, Mac Medic replied 10 months ago

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Mike
Mike
Mike, Mac Medic
Category: Mac
Satisfied Customers: 8,997
8,997 Satisfied Customers
Experience: Over 20 years IT experience with Apple computers in publishing, marketing and design.

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