Hi all, Have been having some booting issues with my MacBook Pro '13 (Summer 2012) as of today and was hoping I could get some help here. I've had this laptop since Jan '13 and asides from some kernel panic issues which were causing it to restart that were resolved when I updated to Mavericks from Yosemite last year I haven't had any noticeable problems - until now, that is. The MacBook starts and gets through to the Apple logo + progress bar screen fine. The progress bar is slower than usual and gets to just over 2/3rds and then remains stuck there. After a few minutes, the progress bar turns into a white rectangle (have uploaded a pic as wasn't able to find any info on this online) for a couple of minutes before changing back to the usual bar and staying there. It's remained stuck there for roughly 40 minutes so far. Some things I've already tried: - Gone into recovery mode and used Disk Utility to perform First Aid on my hard drive - Used fsck - fy in single user mode, volume was modified once then ran the prompt again and got the "...appears to be OK" message - Reinstalled the OS X (currently on El Capitan, as I was before the issues started) - Tried booting in Safe Mode to no avail - however unsure if I've been doing this correctly as can't hear the start up sound as volume on MacBook is muted, probably a really easy solution to fixing that though? I haven't used Time Machine as far as I'm aware (super clever, right?) but I have a 1TB USB 3.0 hard drive which I understand I can use to get any important files from the MacBook if it comes to that? Any help in resolving this issue would be vastly appreciated - been going through some stress-related medical issues this year and a busted MacBook is certainly not going to make me feel any better. Thanks!