Q: macbook pro mid-2010 deleted mac parition and now will not boot
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Jan 15, 2016 7:24 AMby deejaymojito,How will i repair disk? i can never get to disk Utility. So far I can boot in windows lasts 1 minute and then crashes( goes to white screen no loading no Apple sign). if i do option then i get option to boot from hard drive i do that and it tries to install and crashes ( goes to white screen) is there any other way to reach disk utility? should i do hardware test?
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Jan 15, 2016 7:39 AMby lllaass,If yo have access to another Mac
- Download the appropriate OSX installer. They should be listed in the Purchased section of the Mac App Store if you previously downloaded them with the ID you are using.
- Make a bootable USB media using the following:
- Boot from that media
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Jan 15, 2016 8:30 AMby deejaymojito,i followed this. http://www.macworld.com/article/2367748/os-x/how-to-make-a-bootable-os-x-10-10-y osemite-install-drive.html and this is macbook so i do not have external devices.
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Jan 15, 2016 8:32 AMby EcoGreg,You have not stated what OS version you had.
Sounds like you lost (deleted) your Mac OS install. When you boot with Option key, do 2 partitions show up?
Here is an Apple KB on re-installing OS on Mac.
How to reinstall OS X on your Mac - Apple Support
You may want to try a Recovery Mode re-install.
Hope you have every thing backed up as I would recommend that you do an erase and clean install. This will also wipe out your Windows partition, but you really want a clean system. I don't recommend Migration Assistant for this and vastly prefer fresh install of apps, then drag and drop for files.
Also check if Apple has a Service Bulletin out on your computer. There have been some GPU replacement programs for certain models.
Laptops are very susceptible to overheating due to dust bunnies. Have you ever had your computer cleaned inside?
Make sure you keep at least 15-25% free space on your hard drive.
Hope this helps, Greg
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Jan 15, 2016 8:43 AMby deejaymojito,I had Yosemite installed and i was trying to reinstall yosemite as well. When I boot with option key i only see windows and my hadrddrive if it's connected. So you suggest reinstalling through recovery not sure if that will work. I do not have backup unfortunately my hard drive crashed too which is why i was trying to back up everything again and middle crashed and lost everything. one of those days you know.
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Jan 15, 2016 8:48 AMby lllaass,Can you boot to Recovery?
OS X: About OS X Recovery - Apple Support
If you upgraded the EFI firmware of your Mac yo also have internet Recovery
Computers that can be upgraded to use OS X Internet Recovery - Apple Support
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Jan 15, 2016 8:53 AMby EcoGreg,I suggest you try the Recovery Mode this is a hidden partition so it most likely still exists
Can't promise what will happen and it may attempt to over write your Windows as well.
Just guessing that you deleted the Mac side while in Windows, Windows installation is dependent on MacOs being present.
I keep at least 2 back-ups and 2 clones for my computers just for this reason. Not a question of IF, only a question of WHEN.
Hope this helps, Greg
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Jan 15, 2016 5:23 PMby deejaymojito4889,I can see recovery drive now but still as soon i click it within few second it goes to white screen and stuck forever. I try to boot in single mode to try fsck -fy but same problem again in middle of process it goes to plain white screen and stuck. There is some other issue here for sure. maybe it is GPU ? how do i get away with this ****.
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Jan 15, 2016 7:15 PMby EcoGreg,DeeJay
If you have access to another Mac you can access the hard drive in Target Disk Mode or by pulling out the drive and stick it in an external enclosure or dock. Copy whatever you can.
Then erase the drive, format to Mac OS Journaled and then install the OS while still in the external device. Install back into the computer and then you can determine if you have other issues.
You could also take the opportunity to install a faster or bigger internal drive as a replacement.
iFixit has step by step instructions
Hope this helps, Greg
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Jan 18, 2016 9:34 AMby lllaass,To me it apears that either your Mac has a hardware problem or that the format/file on the HD are messed up and it tryies to boot to a Recovery partion and gets confused bevause of what it reads on the disk.
If you disconnect the internal disk and connect a SB non-system disk then if you can boot to Internet Recovery that indicates a problem with the internal drive.
