i can't start my macbook pro (2012). its show a blank white screen for about 1 hour. what should i do?

Question

i can't start my macbook pro (2012). its show a blank white screen for about 1 hour. what should i do?

MacBook Pro (13-inch Late 2011)

Posted on Apr 24, 2013 7:05 AM

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Answer 1

Apr 24, 2013 7:09 AM in response to amrimustafa12

Work through the suggestions for freezing at startup, says 10.6 but is true for Lion and Mountain Lion, also.

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Answer 2

The hatter

Level 9

60,990 points

Apr 24, 2013 7:14 AM in response to amrimustafa12

Troubleshooting: My computer won't turn on

https://support.apple.com/kb/TS1367

Symptoms

If your Macintosh computer won't turn on, here's how to troubleshoot it. Please keep in mind that although your computer may display similar symptoms that prevent it from showing video, this article discusses what to do if the computer won't turn on, meaning that when you press the power button:

You don't hear a startup chime.
You don't hear any fan or drive noise.
The power button or power indicator doesn't light up at all.

If your computer doesn't display any video, it may display one or more of these similar symptoms when you press the power button:

You may hear a startup chime.
You may hear fan or drive noise.
You may see the power button or power indicator light up.

If any of these conditions occurs, see Troubleshooting: My computer has no video instead.

Resolution

If your computer won't turn on, try each of these steps:

Make sure that the power cord is plugged into a working wall outlet, and that it's properly connected to the power adapter. (To check if the wall socket is working, plug in a lamp or other electrical device.)
Make sure that the power adapter is properly connected to the power port on the side or back of the computer.
Disconnect all accessories that are plugged into the computer, such as a printer, hub, or other mobile device.
Reset the computer's PMU, SMC, or PRAM. Refer to the instructions for your model: