Hi I am kind of a noob, as fortunately I have not had many problems in the past. I have a MBP 2.53Ghz mid-2009 machine. I am experiencing the install problem with the hard drive. I cannot get past the grey screen on re-boot up - it either goes on endlessly spinning or goes to the "no entry sign". Occasionally it goes to grey screen briefly before crashing out and switching itself off, which is kind of a worry. I have tried booting from recovery and repairing the hard drive (no problems with the HD before install) then restarting. It let me in the first time to Mavericks, but since then if I restart the machine I cannot boot up again. I am able to re-boot from an external cloned (SuperDuper) drive into my old configuration - Lion 10.7.5 with all data. Once booted up I can still access the internal HD on my machine. It is not a massive issue, but the back up is a couple of weeks old. What I would like to do is: - update some user files from the internal HD onto the clone drive (documents, downloads, spreadsheets etc) - by draggin and dropping folders between Finder windows. - then I want to copy the "updated" external clone drive back onto my HD, together with Lion 10.7.5 - I then want to continue using my old configuration until I figure out exactly what is causing my Maverick installation issue. Is this the right way to do this? I do not want to do anything to compromise the back-up data though, and I can live with it being a couple of weeks old, I just want to get back to a situation where I can boot up off my internal HD as I did before I tried to install Mavericks. Thank you in advance for any help, and apologies if this is already covered - although I have searched for a similar question on the forums.