Panic report when Yosemite boots, PLEASE HELP!

That's odd!

So you did following :

0. Checked for any hardware issue and nothing found

1. Tried to enter recovery mode using option key right after Mac starts, but no luck.

2. Tried to reset PRAM using special keys

3. Enter single-user mode and use: /sbin/fsck_hfs -f -d /dev/disk0s2

And none of them helped you?

Let me search more about that.

Two questions :

1. What is the last line of output of the command? Is it something like : ** The volume [Your Volume Name] appears to be OK?

2. Is it possible for you to format your HDD/SSD? I mean do you have any special important info on the disk?

As I googled maybe this is not a very very strange issue!

Take a look at this one.

Specially last answer.

Of course I'm not sure that your internal drive defected !

Gimme some time. Working on a new idea, maybe can help you.

First of all let's rescue your files then we can format your drive :

1. Enter SUM

2. Type command: /sbin/fsck -fy (I think it is optional)

3. Type command: /sbin/mount -uw /

4. Plugin your external hard drive. If it successfully plunged in you should see some special numbers on the screen so press Enter key.

5. Type command: ls /dev/disk* => You should see something like /dev/disk1s1 Note:/dev/disk0* is your internal drive.

6. If all above are OK now try next step

7. Type command: mkdir /Volumes/usb

8. What is your External hard drive format (Fat32, exfat, NTFS, extended journal, ...) ? I assumed you have exfat.

9. Type command: mount_exfat /dev/disk1s1(or something like this) /Volumes/usb/

10. Which directories you want to backup? I assumed one of 'em is "/Users/manili". Note that you can copy whole internal drive by replacing "/" with "Users/manili" (I'm not sure!)

11. Type command: cp -r /Users/manili /Volumes/usb/manili

12. Wait and wait and wait (depending on your data size).

13. Type command: reboot

14. eject external hard drive

15. Now you have a backup of your internal hard drive.

Working on how to format and reinstall Yosemite.

The advice you're being given is very dangerous. You need to get your computer fixed. Anything else you do may result in total data loss.

Hi Linc

Why backing up in that way is very dangerous?

I would suggest at this point that you take it in for repair. My guess would be the HDD data structure is corrupted... probably due to an impending HDD failure. You've done everything short of reformatting the drive and reinstalling the OS. I can tell you from personal experience that just because the system will allow you to reformat the drive, doesn't mean the drive is OK. I had one die two days after reformatting and reinstalling the OS. Hard drive failures do happen, usually at the worst possible moment... like when you haven't backed up the data for the longest time.

If you do get the machine up and running again, I still think you should have it professionally checked out... like I said, sometimes you think you've fixed a problem when in fact all you've done is delayed the inevitable.

Sound advice!😉

To Fearny 😟

The advice given to take it for Backup and Repair, is very sound at this point in time.

If you have not done a backup like this in OS X or Linux/Unix before in the command line, now is the wrong time to attempt it, with your data at risk.

The programs could be reinstalled, but if you don't have at least Two Separate Backups recently updated of your data, you run the risk of destroying your data and loosing it permanently. But only you can be the judge of that.

Do you have two backups? You did manage to run Fsck and enter Single User Mode? To get the result that indicates that the drive is OK?

i typed 'diskutil list' & got back:

'Unable to run because unable to use the DiskManagement framework.

Common reasons include, but are not limited to, the DiskArbitration

framework being unavailable due to being booted in single-user mode.

bash-3.2#'

In addition to adhering to the above advice, you could read through this article to have a good understanding

http://macs.about.com/od/MacTroubleshootingTips/tp/Top-10-Troubleshooting-Tips-F or-Mac-Startup-Problems.htm