Can't use my mac since mavericks update but I didn't backup when I had snow leopard because I had no external hdd until I recently bought one. Can I revert back to SL?

Question

So, here's the thing I just upgraded to Mac OS X Mavericks from SL but since upgrading my mac shuts off immediately by itself so I use it in safe boot. When I was running SL I didn't backup my stuff because I had external hdd, but I just bought one and I want revert back to snow leopard. How do I go back to snow leopard while also taking all my saved stuff even though I didn't backup it back then when I using SL?

Answer 1

Hei [email protected]
PROBLEM
=========
After upgrading to maverick 10.9.2 my camera stopped working on my iMac and on my MacBookPro. 
First I suspected that it was the maverick upgrade, which was the problem.
After spending several days with searching on the internet and trying all the different suggestions.
Which included re-format hard disk, re-install Maverick again, safe boot, removing old *.kext files, repair disk, check disk with permissions etc. etc. (waste of time)
 I phoned apple support, but supporter said that it was a non apple App which caused the problem. 
Then I say somebody saying that the AirDisplay was the problem.
SOLUTION
==========
I finally found out that:
By uninstalling the AirDisplay solved the problem, and now the camera works again.
Here is the link  how to uninstall AirDisplay:
http://www.avatron.com/support/faq-air-display/#toggle-id-24
PLEASE Avatron
==============
When do Avatron have a fix for this particular problem. No update was available today when I tried.
Are Avatron working on the problem?
A lot of people have this problem with AirDisplay and Maverick Update 10.9.2 !!!!!
search google
maverick 10.9.2 facetime camera air display not working
Regards
Finn Rosenkilde Rasmussen / ([phone]
http://www.linkedin.com/in/hvepseeksperten
HvepseEksperten.dk ApS
Kongens Vænge 79
3400 Hillerød
Denmark