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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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Press the Command and R keys at the same time when the grey screen appears and hold them until you see the Apple logo. A small loading bar will appear under the logo. Sit tight as your system boots into Recovery Mode. Click the Utilities tab in the top menu bar, select Terminal, type resetpassword and press Enter
startup and regular sound White screen appears but no apple logo appear ,
1) smc have been reset multiple times. possible motherboard video hardware issue cause over heating.
2) hold option key switch on laptop it will be see hard disk or DVD drive (apple disk inside) icon, the motherboard good if icon appeared. and the motherboard video dead if not appear. hope to help a little
The time bar may be telling you that there's damage to the hard drive, or perhaps just your hard drive's main partition. If your Mac is running OS X Lion or Mountain Lion, you should have a recovery partition with Disk Utility on it. Restart your Mac while holding down Command-R to boot into this instead of your regular partition. Follow Apple's instructions on how to use Disk Utility to see whether the hard drive is damaged or just corrupted (and potentially corrupted).
Find you apple install CD's and choose the one that says application install. as you turn in on try and put the CD in and hold down the D key this should run the disk before start up and allow you to run a hardware check.
You will need to put in the Mac install DVD, once that loads up on your computer on the main bar go to utilities and then disk utility. from there click repair disk. If this fails you will have to reformat your disk and install a clean version of Mac.
does it have ram inside. safe boot is a must. it took me 5hours to hack g4ibook 4 my 1rst time fscky aka command line. or on your other mac do superduper app.
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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