How to reformat and uninstall Lion OS X completely

okizen

macrumors member
Original poster
Jan 21, 2012
84
0
How do I uninstall Lion OS X completely and then reinstall Lion OS X. I don't have a dvd/cd backup of the OS X.
 

Nov 28, 2010
22,668
27
located
Create a bootable Lion Installer:
Then do a Clean Install (guide can be used for Mac OS X 10.7 Lion too):
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Or if your Mac has a Lion recovery partition, boot from that and make a clean install:
 

thebritishguy

macrumors member
Dec 30, 2011
56
0
How do I uninstall Lion OS X completely and then reinstall Lion OS X. I don't have a dvd/cd backup of the OS X.
either create a copy of the Lion install on a USB thumb drive (search create Lion install USB Stick in google, loads of walk throughs there) or use the internet recovery process (see link)

http://support.apple.com/kb/HT4718

Both options will give you the ability to use disk utility to remove the original Lion partition and create a fresh install

TBG
 

thebritishguy

macrumors member
Dec 30, 2011
56
0
Create a bootable Lion Installer:
Then do a Clean Install (guide can be used for Mac OS X 10.7 Lion too):
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Or if your Mac has a Lion recovery partition, boot from that and make a clean install:
you type faster than me obviously!
 

heisenberg123

macrumors 603
Oct 31, 2010
6,496
9
Hamilton, Ontario
How do I uninstall Lion OS X completely and then reinstall Lion OS X. I don't have a dvd/cd backup of the OS X.
if you purchased lion from the mac app store i would do this

make bootable copy of lion

of course if it came preinstalled it won't be on your purchased tab in mac app store so you won't be able to make a bootable copy


so the above advice will work, both processes required you to re-download lion but with the bootable copy you will have it already for the time after this you might have to re-install
 

okizen

macrumors member
Original poster
Jan 21, 2012
84
0
Create a bootable Lion Installer:
Then do a Clean Install (guide can be used for Mac OS X 10.7 Lion too):
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Or if your Mac has a Lion recovery partition, boot from that and make a clean install:
I've been trying all methods. Sometimes after booting, a question mark flashes on the screen or a network connection request comes up and when I put the info required, it justs buzzes and asks me to input again. This is booting with and without the dvd. Other times the disk utility comes up and no matter what I do I seem to be stuck without getting to boot/reinstall Lion.
 

okizen

macrumors member
Original poster
Jan 21, 2012
84
0
Create a bootable Lion Installer:
Then do a Clean Install (guide can be used for Mac OS X 10.7 Lion too):
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Or if your Mac has a Lion recovery partition, boot from that and make a clean install:
either create a copy of the Lion install on a USB thumb drive (search create Lion install USB Stick in google, loads of walk throughs there) or use the internet recovery process (see link)

http://support.apple.com/kb/HT4718

Both options will give you the ability to use disk utility to remove the original Lion partition and create a fresh install

TBG
if you purchased lion from the mac app store i would do this

make bootable copy of lion

of course if it came preinstalled it won't be on your purchased tab in mac app store so you won't be able to make a bootable copy


so the above advice will work, both processes required you to re-download lion but with the bootable copy you will have it already for the time after this you might have to re-install
Thanx for your help guys. I took my machine to the Apple Authorised Dealer and apparently I only had a WEP key for internet security so I couldn't download the Lion Recovery. Anyway he reinstalled the OS. And as soon I got home I immediately made a Time Machine backup if ever this situation arose again.