So I just installed the developer preview of 10.9 Mavericks on my early 2011 MacBook Pro, which has been upgraded with 8gb ram, a 1tb HDD in place of the SuperDrive and a 250gb SSD. The installation went fine and was rather quick, but when I logged in to Mavericks, after maybe 3 seconds my screen's hue shifts blue and I then I'm logged out. I was planning on restoring to Mountain Lion with my Time Machine back ups but they can not be used to restore as they haven't been backing up system files and applications even though these are not excluded!? I entered safe mode and removed all start up items to no avail. I also noticed that an error showed up saying CS5sercicemanager wasn't running or something, so I deleted the file from my application support area. I also noticed that an error says the "to use 'java' I must install a run time environment". I think this may be the problem but when I check the java version in terminal using ' java -version' I'm told that I have a 1.6 version of runtime environment. However I think this might be a default for safe mode which maybe is the reason safe mode works at all? How do I go about fixing this? If there is no way to fix this, can someone explain how I would go about re installing mountain lion and then restoring all my stuff from my time machine back ups? <- in step by step if possible, as I don't want duplicate accounts or missing items etc Also for future reference, how do I make time machine make full complete back ups, as the normal method apparently doesn't back up files needed for restoration.