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Ashik, Mac Technician
Category: Mac
Satisfied Customers: 9784
Experience:  Bachelor of Computer Application (BCA), 9+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
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On start up my screen is flashing between white and the space

Customer Question

On start up my screen is flashing between white and the space screen. oohing happening when apple icon clicked. Mouse is a swirl of colour
Submitted: 4 years ago.
Category: Mac
Expert:  Ashik replied 4 years ago.
Hello and welcome to JustAnswer. I look forward to assisting you today with your question and providing the best answer possible.

We can try some basic troubleshooting steps and see if that works or not.

Reset PRAM and NVRAM (Solution 1)

  1. Shut down your Mac
  2. Locate the following keys on the keyboard: Command, Option, P, and R.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
  5. Hold the keys down until the computer restarts and you hear the startup sound for three times.
  6. Release the keys.

Restart in Safe mode
(Solution 2)
Make sure that the computer is shut down. Press the power button. Immediately after you hear the startup tone, press and hold the Shift key. Release the Shift key when you see the gray Apple and progress indicator. Let the Mac boot up...

Run Disk Utility in Single User Mode(Solution 3)
Turn your Mac off. Turn it back on and this time hold down the Command (Apple) key and the S keys at the same time. Then type the following command...

/sbin/fsck -fy (note the space between fsck and -fy)

If you can't run /sbin/fsck - fy then type only fsk - fy

Hit return and the disk utility should run and let it finish. When it finishes and there is no error, then type reboot and hit return. Let the Mac boot up. (Disk Utility will fix all system errors, bad preferences files etc)

Let me know if that didn't worked. Only click Accept after we solved the problem

Remember, if for any reason you are unsatisfied with my answer, we can continue the conversation until you’re satisfied and Accept my answer. I can address follow up questions at no extra charge and I’m always here to help. Thank you for using JustAnswer!
Ashik and 2 other Mac Specialists are ready to help you
Customer: replied 4 years ago.
The mac will not shut down or respond to any key strokes
Expert:  Ashik replied 4 years ago.
Turn off your Mac by pressing and hold down the Power button for 10 seconds and your Mac will turn off.
Customer: replied 4 years ago.
The mac now appears to be working. Many thanks
Expert:  Ashik replied 4 years ago.
You're welcome !