I Baught A iMac 2010 From Someone it came with lion but for the programs i use i need snow leopard but when trying to install it won't boot from usb or cd what can be the problem i've been at this for over 24 hours if anyone ca help it'd be greatly apprec

I Baught A iMac 2010 From Someone it came with lion but for the programs i use i need snow leopard but when trying to install it won't boot from usb or cd what can be the problem i've been at this for over 24 hours if anyone ca help it'd be greatly appreciate it! Thanks!

Downgrade OS X Lion To Snow Leopard [Video How-To]
http://www.cultofmac.com/110614/downgrade-os-x-lion-to-snow-leopard-video-how-to /
How To Downgrade OS X Lion To Snow Leopard: The Complete Tutorial
http://www.redmondpie.com/how-to-downgrade-os-x-lion-to-snow-leopard-the-complet e-tutorial/
How To Downgrade from Apple OS X Lion to Snow Leopard
http://www.pcmag.com/article2/0,2817,2389334,00.asp

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