Q: Yosemite crash
Hi, my MAC after turn ON, half way loading then it shut down, try reset everything include PRAM still same problem.
Now I want to try reinstall the OS, will it wipe the drive? I don't have backup so it's very important not to remove the file.
MacBook Air, Mac OS X (10.7.2), 256GB SSD, 1.8GHZ i7
Posted on Mar 27, 2016 9:15 PM
Hi, my MAC after turn ON, half way loading then it shut down, try reset everything include PRAM still same problem.
Start by trying to boot into Safe Mode
<http://support.apple.com/kb/ht1564>
If you can get booted in Safe mode, see if you have kernel panic reports
Kernel Panic reports: "/Library/Logs/DiagnosticReports"
<http://support.apple.com/kb/ht2546>
<http://support.apple.com/en-us/HT200553>
The panic report should have "panic" in the file name.
If you do have kernel Panic reports, please post 2 or 3 as replies to this thread.
If you cannot boot into Safe mode, try recovery mode, and run disk utility to check your boot disk
<OS X: About OS X Recovery - Apple Support>
Now I want to try reinstall the OS, will it wipe the drive? I don't have backup so it's very important not to remove the file.
Generally, installing the OS over top of an existing install will not erase things, HOWEVER, unless you are re-installing the same version or a newer version, often times the installer will not install an older version on top of a newer version.
NOTE: I would try to get the current system booted if possible, before going down the re-install path.
In theory you could use Recovery mode and Disk Utility to make a backup
You could also use Recover mode to make a clean OS X install on an external disk, and then use that external disk to salvage data from your boot disk.
Posted on Mar 28, 2016 6:12 AM