MacBook stuck 75% on loading screen
HI, I upgraded to El Capitan OS X 10.11 a couple of weeks ago and though it took longer than I'd have expected and two or three attempts, since then the Mac had been working fine and I've been using it most days. One of the things I did notice was that it took longer to start up and spent time on the white loading screen with Apple logo and progress bar underneath it (albeit under a minute) whereas before it would load up almost instantly.
I was using it all day on Monday and have gone to use it today, but it's just stuck on that screen with about three quarters of the loading bar filled but doesn't seem to be progressing. I've rebooted and tried again three times just in case but it does the same thing each time. It's almost impossible to tell if it's frozen or just going really slowly but I thought I'd leave it third time to see whether it does load but just takes a while. It's been about twenty minutes and it doesn't appear to have progressed at all once getting up to that third quarter. Any ideas please?
I tried booting it in safe mode which I've not had much experience of doing before but I don't know if it worked or if it's trying to load in safe mode as we speak!
MacBook Pro, OS X El Capitan (10.11.4), 2010 MacBook Pro
