[SOLVED] Mac OSX Lion Install On iMac Running Windows

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pythagon

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Hi,
This is my first time posting on Tom's Hardware; it's a very good forum where I have found many answers to my questions before, so hopefully someone can help me out here.

It's a long story so I'll try to shorten it best I can, but I want to make sure I am understood correctly, so you'll have to bear with me here. If you are able to solve this without knowing details, feel free to skip below for the question which I will separate.

Back in 2011 I bought myself a 2010 21.5" iMac running OSX Lion, second hand. I really enjoyed using Mac for applications such as iMovie and GarageBand, which is the main reason I bought it, however it wasn't living up to being able to run similar programs to the ones I knew so well on Windows. I tried my luck delving into the world of BootCamp, and was pretty successful with it, only a few problems that were easily sorted. However, I never took into account the partition size for Windows, and it ended up getting full up, until I discovered file compression (windows feature), that long story short, led to me to corrupting the hard drive of my mac. I lost everything on it, and ended up not being able to install a copy of OSX Lion that I had on a USB drive due to incorrect partition formatting for the mac, that I never worked out. I installed windows on it, and for two years it ended up sitting in the corner of my room acting as a file server. However; I'm missing using GarageBand and am getting to the point where I need it to help me with composition for my Music course at school, and I am need of installing OSX back onto it.

TLDR: So, what I'm basically trying to ask is if there is a way that I can partition my current windows hard drive, and use my copy of OSX on my USB pendrive (that I downloaded from the Mac App Store when it was functioning) to install onto a fresh partition.

Heads Up: I have backed up my iMac hard drive fully, and am prepared to wipe my iMac if need be.
 
Solution
It's called EFI; but it's not really configurable on a Mac in the way that the BIOS is on a PC.

A 2010 Mac can't do online recovery without an update to the EFI; to do this you need to be running OS X - Catch 22.

The OP knows how to boot from the flash drive and install the OS X; the problem is that, for reasons I explained, the install fails. Most likely, as already explained, this is because the hard disk is partitioned using an MBR partition scheme.
G

Guest

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There are some programs that can make a bootable USB Mac OS X installer, even on Windows. Use this to reformat , repartition and reinstall Mac OS X.

Like this: http://www.makarandmane.com/computer/tips-and-tricks/apple-mac-os-x/create-bootable-usb-mac-os-x-installer-from-windows/
 

pythagon

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Thanks for your response, however this is not what I'm looking for. I have a bootable USB with Lion on it, however when trying to install to a new partition created on Windows, it tells me that it is unable to install due to the partition being in the wrong format. Any ideas?
 
The disk needs to be partitioned using the GPT scheme. It is likely that your disk is partitioned with the MBR scheme. You need to delete all partitions and create a new partition. In the "Advanced" options make sure that GPT (or GUID) partitioning scheme is selected.

This means wiping the disk and starting over.
 

Alex Whitfield

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Mac isn't like windows.
Windows can be installed on a blank computer a linux a mac or even something with a different version of windows.
Mac is pretty much like this.
It needs to know it is a mac otherwise it won't comply with you.
Mac is picky to put it blankly.
Okay enough on that lets touch on what you need to do shall we?
Basically put you gotta have mac first than any order of other os but you can't put linux or windows than mac.
You need to flash the hard drive clean turn off wait 30 seconds turn back on to a blank pc.
Now you should be on the bios what needs to be done is you go to select where to install an os from (it will be bugging you with different options) you need to set it to flash drive/thumb drive (different bios' s call it different things) now of course have your flash drive in and set it to run finding and installing the os on it (osx).
Okay now I am sure you wanna keep windows also right?
Make a system repair disk and image before you flash your hard drive so you can remake the windows partition later.
Hope this helps feel free to ask any questions.
 

Bearing in mind that the OP stated he was dealing with an iMac, most of this post is not relevant. No BIOS on a Mac.
 

Alex Whitfield

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May 6, 2013
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Well everything has a basic running software including mac but it isn't called abios I am not sure what it is called but since it is similar to what goes on in a bios I called it that.
Basically if he started it without a os it would bug to install one which he could from his thumbd ive or he could just do online recovery.
 
It's called EFI; but it's not really configurable on a Mac in the way that the BIOS is on a PC.

A 2010 Mac can't do online recovery without an update to the EFI; to do this you need to be running OS X - Catch 22.

The OP knows how to boot from the flash drive and install the OS X; the problem is that, for reasons I explained, the install fails. Most likely, as already explained, this is because the hard disk is partitioned using an MBR partition scheme.
 
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