I recently installed Mavericks on my main computer, after seeing problems with Yosemite, mainly that one problem when the system stops functioning and shows the spinning beach ball, while giving me no control of my computer whatsoever. Well... it's back, even after downgrading. I'm super-stressed trying to figure out what on earth is happening. Luckily, sometimes, I still succeed in booting the system for a whole day. My first idea was that there is some sort of virus. I noticed that when it crashed the first time, it was while copying my Music folder (since I did not have a 10.9 TM backup). It happened again, while copying that same folder, but I noticed that it was while there was about 26GB of data copied, so I suspected that there was a file which does that. I decided to import all of my media from iTunes, and the system crashed while copying a certain Apple podcast. I decided to delete that file, it worked fine for a day, and... it now crashes every 10 minutes. This leads me to a second idea: it's a hard drive issue. If you remember my "I'M MAD I CANT INSTALL MAVERICKS ANGRY FACE" topic, you know that I had trouble formatting the drive and everyone told me that my HDD is dying. Well, I think they were right. When (on Yosemite) I tried to partition the drive, the system crashed and would never boot again (although the files stayed intact). After downgrading, today, I tried doing a Verify Disk on my partition, following by a beautiful (not) crash. Now, I can't use the system at all since it boots up ready to crash. Anyone has suggestions? If someone courageous enough wants to test the suspicious file, PM me. Someone PLEASE reply, I'm not writing this for nothing.