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Mike
Mike, Mac Medic
Category: Mac
Satisfied Customers: 8698
Experience:  Over 20 years IT experience with Apple computers in publishing, marketing and design.
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My MacBook pro 17 when started screen becomes covered with

Customer Question

my MacBook pro 17 when started screen becomes covered with squares and locks up
Submitted: 10 months ago.
Category: Mac
Expert:  Mike replied 10 months ago.

Sounds like a hardware failure but there are a couple things we can try. Does it have a removable battery?

Customer: replied 10 months ago.
no
Expert:  Mike replied 10 months ago.

OK try this:

Resetting the SMC & PRAM on portables with a battery you should not remove on your own
1. Shut down the computer.
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.
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.
7. Hold the keys down until the computer restarts again at least twice.
8. Release the keys.

Customer: replied 10 months ago.
turned ok but screen still has little squares all ovr the screen
Expert:  Mike replied 10 months ago.

Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. If the squares are still present then you have a hardware failure and it needs repair. If not then it is software issue and you should try reinstalling the system.

Customer: replied 10 months ago.
did what you suggested but screen still has squares on it and is now locked up
model a1297 17' mid 2010
please advise thank you
Expert:  Mike replied 10 months ago.

Then it has a hardware failure and it needs repair... nothing more you can do. Just hold the power button for 10 seconds to shut down. Sorry.

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