Question about Apple MacBook Pro Laptop Computer with Intel Duo Core 15.4 Inch PC Notebook

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My MacBook will not boot up

The white screen will appear, but the apple logo never shows up. It just sits there with the white screen, and my main screen never loads. after waiting a while, a folder logo where the usual apple logo is, appears with a question mark on it.

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Go to bios setup load optimal defaults.
then save.

Posted on Nov 12, 2008

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Posted on Jan 02, 2017

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APPLE MACBOOK


If you get the Apple logo with spinning lines underneath it but not getting past this stage then the hard disc is being seen but something is failing in the boot process, causing it to stall.
Most likely this is a case of incorrect file permissions which is easily solved.
There are 2 ways of doing it, depending on whether you have an OS X install disc to hand or not.
IF YOU DO HAVE AN OS X INSTALL DISC:
Insert the disc into the DVD drive, power on the Mac on after hearing the chime hold down the C key. This forces the Mac to boot from the DVD. After a few minutes you'll get a screen asking which language you wish to use as the main language; select English or whichever is appropriate for you.
On the next screen the Installer box will appear. Ignore this and instead on the menu at the top of the screen select Utilities -> Disc Utility. Once this has loaded select your hard drive on the left hand pane and then first click "Repair Disc" and once that has finished click "Repair Permissions".
Once these have completed successfully reboot and OS X should load up fine.
IF YOU DON'T HAVE AN OS X INSTALL DISC:
This is a bit more tricky. You have to boot into single user mode. To do this power on the machine, and after the chime hold down Cmd (Apple key) and S together. The screen will turn black and an a load of white text will start appearing and scrolling upward as the system loads. Basically this is what happens behind the Apple startup logo, only in single user mode rather than multiple user mode.
After a few moments the text should stop scrolling and you should see a prompt which looks similar to:
localhost: / root#:
Note that localhost is the name of your computer so will possibly be different to "localhost". At this point type the following EXACTLY including spaces, capitalisation and dashes etc:
/sbin/fsck -fy
now press enter, then type:
/sbin/mount -uw /
now press enter then type:
diskutil repairPermissions /
and press enter. It may take a few minutes to repair the disc's permissions, but once complete you should have the 
localhost: / root#:

prompt again. Now type:
reboot
and hit enter. The system will then reboot and should boot into OS X without issue.

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