Can i reinstall OS X Mountain after installing Yosemite

can i reinstall OS X Mountain Lion after upgrading to Yosemite10.10.2
I was trying to install lion, and erased my hard drive but now cannot access the drive, I have tried to install to use the usb boot disk but will not load, I get a file folder with a question mark flashing. just don't know what to do now, any help would be welcome . thanks

Lizardcarter's instructions are correct, you can (and possibly should) consider a second external HD to create a bootable clone. Redundancy in backups is a very good thing because backup can fail too. A bootable clone is an external HD that has a mirror of your internal HD so if the internal HD does crash you can boot from the clone, something that cannot be done from TM. This means you will be down for minutes and can resume work until you have had the internal HD replaced. Never use an external HD for both TM and a bootable clone, each should have it's own EHD. The reason being is if the EHD crashes you have lost ALL of your backup and are dead, don't laugh it happens! To create a bootable clone get either SuperDuper or Carbon Copy Cloner (both about $30) and you're pretty set. Many people on these forums (including myself) use that strategy and yes I have had a backup fail.

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Hi there
Forums 101: If you want us to actually see images, never Never NEVER attach them. Instead, use the camera icon to insert them.
As for the output files not opening on other PCs, were you certain that you copied ALL the files? Normally there are at least a SWF, HTM and JS file to copy. Depending on what you did with the project, there may be additional files to include.
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Helpful and Handy Links
Captivate Wish Form/Bug Reporting Form
Adobe Certified Captivate Training
SorcerStone Blog
Captivate eBooks

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Why am i getting the following error message after installing Mac OS X 10.10 Yosemite and trying to scan in photos through Photoshop CS6: Could not complete your request because a SOFn, DQT, or DHT JPEG marker is missing before a JPEG SOS marker?

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Frustrated in Baltimore

Try what Terence Devlin posted in this topic:
Terence Devlin
Apr 14, 2015 11:21 AM
Re: Is Iphoto gone ? i want it back!
in response to Johannes666
Recommended
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http://support.apple.com/kb/HT4928
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Welcome to the Apple Support Communities!
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Can i reinstall OS X Mountain after installing Yosemite

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