Boot stuck with a full loading bar?

[MJN42]

I installed 10.11 on my laptop, and everything seemed to go ok with it, bar the installer being extremely slow - it took around 2 hours to install with the progress bar remaining on '23 minutes remain' for around an hour and a half.

Now when it boots, it going fine until about the loading bar is maybe 2/3 done, then slows to a crawl and takes another 20 minutes or so to reach full - where it stays. I have no cursor or anything else during this time, but my caps lock button light will go on an off when I press it.

I've tried:
-Resetting PRAM/NVRAM
-Booting into recovery mode and repairing the drive/partition
-Re-installing Yosemite. Naturally, this says that it can't be written over a higher OS version.
-Booting hardware diagnostics and doing a check. It says everything is fine.
-Safe boot. Takes the same length of time and hangs at the same place, so honestly not sure if I'm even doing it right.
-Verbose mode says every single process has crashed, with 'too many corpses being created.'. Picture:http://i.imgur.com/WXvTTe5.jpg

It's a Mid-2011 15" Macbook pro, 2.2GHz with a 750GB hard drive and 16GB of RAM. I'm still doing a few other checks (currently re-installing 10.11 to see if that fixes it), but has anyone got any ideas or had a similar problem?

 

[Lowe Lilliehorn]

Alright, it seems like it is a BIG BIG problem. Well, as you wrote, you can't do anything? Well, you can do one thing, if you open Internet Recovery (CMD + R + Alt) white booting up. This will downloading the first OS X that your mac was shipped with... The only bad thing about this is that you have to upgrade from Lion (i Think) to ML (Mountain Lion) to Mavericks to Yosemite to OS X El Capitan (10.11) BETA... Well, if you aren't sure about this, go to a retail store and let em' look at it.... And even better if you call Apple Support and pay a fee and they do it while you are in the phone

 

[Kdookie]

Alright, it seems like it is a BIG BIG problem. Well, as you wrote, you can't do anything? Well, you can do one thing, if you open Internet Recovery (CMD + R + Alt) white booting up. This will downloading the first OS X that your mac was shipped with... The only bad thing about this is that you have to upgrade from Lion (i Think) to ML (Mountain Lion) to Mavericks to Yosemite to OS X El Capitan (10.11) BETA... Well, if you aren't sure about this, go to a retail store and let em' look at it.... And even better if you call Apple Support and pay a fee and they do it while you are in the phone

[doublepost=1514310655][/doublepost]I am being directed to the recovery page

 

[Jbar23]

I have the same issue for almost 4 weeks. Genius Bar can't help. I got who I thought is a very well informed tech from Apple Care phone support helping me but even he is stumped. At minimum, before anything, I installed another HD so whatever I do, I still can migrate data from the old HD. This is one gigantic headache and at this point, I almost feel like Apple should not only provide a brand new MacBook Pro but somehow retrieve all my data and apps in fully working condition. Four weeks is a ridiculous amount of time to deal with something and get no acceptable results. I work a day job like everyone else an don't have an extra 40 hours a week to fix a laptop. So anymore info anyone can provide would be extremely and greatly appreciated.