New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Running Windows (or anything else) on your Mac Discussion of Classic or running Windows, Linux and other OSes on the Mac.

Can't boot OSX, trying Ubuntu but can't run LiveCD or LiveUSB


Post Reply New Thread Subscribe

 
Thread Tools
kabraz

 
Member Since: Jul 16, 2010
Posts: 1
kabraz is on a distinguished road

kabraz is offline
So through a series of increasingly poor decisions, I unintentionally wiped a partition that appeared (while in Disk Utility) and am unable to boot my compter. At all. It was 200mb and had something like 49 hidden files, and since I'd never seen this partition before I decided to format it in hopes that it would just...disappear. Bad move.

In conversation with a friend, he believes I deleted the Partition Table...? and I can no longer boot into OSX. Upon restart I get a gray screen (no Apple Logo), then black screen with "Error loading operating system".

Next I tried creating a liveUSB and liveCD of Ubuntu in hopes of accessing my HD, removing all essential items, and then wiping the HD completely and installing Snow Leopard (currently on Leopard). Tried holding down "C", "Option", Shift + Option + CMD + Delete" (read on some forum) and nothing will let the computer read the files. I've checked on other PC's that the CD does actually contain the properly burned ISO and all.

Running on a 2007 Macbook with an upgraded 500gb HD. Don't have any other specs on it other than that...bit of a newb. Any help would be greatly appreciated as HD contains important files...obviously...haha.
QUOTE Thanks
MacKeeperUser

 
Member Since: Jul 16, 2010
Location: Ukraine, Kiev
Posts: 40
MacKeeperUser is an unknown at this point

MacKeeperUser is offline
I do not understand. You have got to boot from a live USB drive or a live CD?
If not, then what reason?
QUOTE Thanks
chscag

 
chscag's Avatar
 
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,116
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

chscag is offline
Quote:
So through a series of increasingly poor decisions, I unintentionally wiped a partition that appeared (while in Disk Utility) and am unable to boot my compter. At all. It was 200mb and had something like 49 hidden files, and since I'd never seen this partition before I decided to format it in hopes that it would just...disappear. Bad move.
What you nicely deleted was your EFI partition which effectively killed OS X. The solution is to reinstall OS X as you found out. Try resetting the PRAM/NVRAM first and then try rebooting with the Linux live CD again. If it doesn't work, try this procedure which is below here:

*********************************************

Restore default bootloader without harming partitions

Fri, Nov 20 2009 at 7:30AM PST • Contributed by: tofergregg

If your bootloader gets changed or corrupted, this fix will restore it without damage to your disk partitions.

This hint may be a bit esoteric, but I thought I was up for a long night of reinstallation pain before stumbling upon this fix. I made the mistake of trying to use an Ubuntu 9.04 boot CD to install Ubuntu to an external (USB) drive on my Mac.

Don't do this, unless you know the following: Regardless of the fact that you chose the external drive upon which to install Ubuntu, you won't be able to boot back into your Mac without changing the bootloader. I ended up with the dreaded question mark folder when I tried to reboot my Mac, and nothing worked to boot into my OS X partition.

Luckily, I have a bootable external drive with OS X on it, and I was able to boot into it by holding down the Option key (the primary partition still did not show up).

I started searching online for the fix, and it seems that Ubuntu changes the Darwin (default) bootloader to Grub on your internal disk, and OS X won't use it (at least not by default). The fixes listed were kludgy, and amounted to either installing another third party bootloader (called "rEFIt") or completely wiping your internal drive and reinstalling OS X (even a standard install won't work).

Anyway, the fix turned out to be easy with Disk Utility (and probably possible from the OS X boot disc). Run Disk Utility and click on your internal hard disk (the disk itself, not the partition under it). Then click on the Partition tab. If you move the triangular slider that adjusts the partition up and then back to where it was, the "Apply" button becomes active (it starts greyed out). You can now click "Apply," and the partition will be left alone, but the bootloader will be recreated.

When I did this, a window popped up that said, "Are you sure you want to partition the disk? Partitioning this disk will change some of the partitions. No partitions will be erased." If you get a message that partitions will be erased, I'd look into it more before going ahead!

I was surprised that this worked, but when I rebooted, the computer booted straight into OS X from the internal drive.

**********************************************

Note: You may actually have to use another machine via firewire for this to work for you. The only other option I can think of is remove the HDD, place it in an external carrier, try to extract what data you can using whatever means at your disposal. And then wipe the drive for a reinstall of OS X.

Regards.
QUOTE Thanks

Post Reply New Thread Subscribe


« Convert Dynamic disk back to basic | Parallels - win 98 »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
macbook wont boot into osx zelores Apple Notebooks 5 01-06-2010 02:29 PM
MacBook 13" will not boot from drive or DVD, wan't to revert to stock eruantien02 OS X - Operating System 2 04-17-2009 06:22 AM
Cant boot in to OSX......HELP!!! JaneChua OS X - Operating System 12 03-23-2007 09:27 PM
OS9/X dual boot probs, OSX install probs willc0de4food OS X - Operating System 3 02-21-2007 12:42 PM
MBP will only boot to XP, not OSX ranathari Running Windows (or anything else) on your Mac 2 01-09-2007 04:51 AM

All times are GMT -4. The time now is 04:19 PM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?