Hello. I've installed OS X El Capitan Beta few weeks ago. Everything worked fine, I used the MacBook for weeks without any problem. Then happened that at startup, the MacBook was very slow in loading screen. After many minutes (about 10-20) it reached the end of the bar under the apple, but it gets stuck there. For hours nothing happens. I've tried everything: S.O.S on the HD (everything is fine), tried to install OS X Yosemite (impossible of course because it finds a newer version of OS X), tried to reinstall OS X El Capitan. But NOTHING changed. The last try i did was to delete an app that I've installed before this happened. I thought it could be related to this problem so I gave it a try. It's a Vodafone app that I used to connect to Internet by USB. I deleted all the files related to that app through the terminal, the app in Applications folder, the files in Application Support folder and also a file related located in a folder called "Incompatible Software", but NOTHING changes again. Every time it loads for ages and then it gets stuck. Now, I know that probably the only solution I have is to reformat the HD, but I was wondering if anyone else had the same or similar issue or just knows what to do in this case. Fortunately, I have Bootcamp, so I could copy my files from there to an external HD before reformat the MacBook. I hope you could help me and forgive me if I made grammatical errors. Thank you.