Flashing Folder with Question mark comes up at starup MacBook
Reinstalling
Lion Without Erasing the Drive
Boot to
the Recovery HD: Restart the computer and after the chime press and
hold down the COMMAND and R keys until the menu screen appears. Alternatively,
restart the computer and after the chime press and hold down the OPTION key
until the boot manager screen appears. Select the Recovery HD and click on the
downward pointing arrow button.
Repair
the Hard Drive and Permissions: Upon startup select Disk Utility
from the main menu.
Repair the Hard Drive and Permissions as
follows.
When the recovery
menu appears select Disk Utility. After DU loads select your hard drive entry
(mfgr.'s ID and drive size) from the the left side list. In the DU status area
you will see an entry for the S.M.A.R.T. status of the hard drive. If it does
not say "Verified" then the hard drive is failing or failed. (SMART status is
not reported on external Firewire or USB drives.) If the drive is "Verified"
then select your OS X volume from the list on the left (sub-entry below the
drive entry,) click on the First Aid tab, then click on the Repair Disk button.
If DU reports any errors that have been fixed, then re-run Repair Disk until no
errors are reported. If no errors are reported click on the Repair Permissions
button. Wait until the operation completes, then quit DU and return to the main
menu.
Reinstall
Lion: Select Reinstall Lion and click on the Continue
button.
Note:
You can also re-download the Lion installer by opening the App Store
application. Hold down the OPTION key and
click on the Purchases icon in the toolbar. You should now see an active
Install button to the right of your Lion
purchase entry. There are situations in which this will not work. For example,
if you are already booted into the Lion you originally purchased with your Apple
ID or if an instance of the Lion installer is located anywhere on your
computer.
Or for Snow Leopard:
Reinstall
OS X without erasing the drive
Do the
following:
1.
Repair the Hard Drive and Permissions
Boot from your
Snow Leopard Installer disc. After the installer loads select your language and
click on the Continue button. When the menu bar appears select Disk Utility from
the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and
drive size) from the the left side list. In the DU status area you will see an
entry for the S.M.A.R.T. status of the hard drive. If it does not say
"Verified" then the hard drive is failing or failed. (SMART status is not
reported on external Firewire or USB drives.) If the drive is "Verified" then
select your OS X volume from the list on the left (sub-entry below the drive
entry,) click on the First Aid tab, then click on the Repair Disk button. If DU
reports any errors that have been fixed, then re-run Repair Disk until no errors
are reported. If no errors are reported click on the Repair Permissions button.
Wait until the operation completes, then quit DU and return to the
installer.
If DU reports
errors it cannot fix, then you will need Disk
Warrior and/or Tech Tool
Pro to repair the drive. If you don't have either of them or
if neither of them can fix the drive, then you will need to reformat the drive
and reinstall OS X.
2.
Reinstall Snow Leopard
If the drive is
OK then quit DU and return to the installer. Proceed with reinstalling OS X.
Note that the Snow Leopard installer will not erase your drive or disturb your
files. After installing a fresh copy of OS X the installer will move your Home
folder, third-party applications, support items, and network preferences into
the newly installed system.
Download and
install the Combo Updater for the version you prefer from
support.apple.com/downloads/.
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