I have a Mac Pro with four hard drives. I currently have Lion installed on one hard drive. I want to have the option to boot from either Lion or Snow Leopard. How can I do this?

It's best to install Snow Leopard on one of the three remain drives without an Operating System.
You can then install the applications you need from the original media. Create a User Account using Setup Assistant.
Do you want to migrate User Accounts from the OSX LIon boot drive, or are you keeping the User Accounts separate?
Dual-booting just requires holding the option key during startup and selecting either Lion or Snow Leopard.

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What gets Backed Up
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Hi ziccs, is the missing feature to open a group of bookmarks all at once in separate tabs?
I haven't explored the Yahoo! toolbar in detail, but it was just updated recently. I noticed the description "new user interface" on the versions page. You also can use that page to re-install the earlier version and see whether the missing function returns.
https://addons.mozilla.org/en-us/firefox/addon/yahoo-toolbar/versions/

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The latest version of iPhoto - 9.5.1 - requires MacOS X 10.9.x. Is it possible to upgrade your Mac to Mavericks? Then you can buy the latest iPhoto from the AppStore.
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why can't you use the keyboard the way it is printed?

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You can't.
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http://www.apple.com/uk/osx/specs/
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To install Mavericks, you need one of these Macs:
iMac (Mid-2007 or later)
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MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
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OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
2 GB or more of memory
8 GB or more of available space

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iOS: Not responding or does not turn on - Apple Support
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Memory 2 GB 800 MHz DDR2 FB-DIMM

I have a Mac Pro with four hard drives. I currently have Lion installed on one hard drive. I want to have the option to boot from either Lion or Snow Leopard. How can I do this?

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