Adobe Illustrator CC crashes on splash screen

Question

Hi there,
I couldn't find a similar thread with similar solutions so here we go, about 2 months ago my Adobe Illustrator CC stopped opening. It will start up and show the splash screen but then stops while "Reading Fonts" (see image below)
I hadn't changed anything or downloaded anything that I know and I assumed it would start working again but alas.
I have a MacBook Pro (15-inch, Late 2011) running Yosemite 10.10.1
Things I have tried so far to fix the problem:
Uninstalled / reinstalled AI twice.
Restarted my computer a million times.
Cleared cache folders as per other forums suggestions.
Reset system fonts and deleted all non system fonts (Through Font Book, if there's another way to solve the font issue please let me know)
Please help if you can, I'm at a complete loss.
Thanks.
Screen it gets stuck on:

Answer 1

Alice,
Item 1) and 11) under 5) in the following list may be relevant (I am unsure whether FontBook serves you well), and the full 6), too.
The following is a general list of things you may try when the issue is not in a specific file, and when it is not caused by issues with opening a file from external media. You may have tried/done some of them already; 1) and 2) are the easy ones for temporary strangenesses, and 3) and 4) are specifically aimed at possibly corrupt preferences); 5) is a list in itself, and 6) is the last resort.
If possible/applicable, you should save current artwork first, of course.
1) Close down Illy and open again;
2) Restart the computer (you may do that up to at least 5 times);
3) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);
4) Move the folder (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible), for CS3 - CC you may find the folder here:
https://helpx.adobe.com/illustrator/kb/preference-file-location-illustrator.html
5) Look through and try out the relevant among the Other options (follow the link with that name, Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy, Item 15) applies to CC, CS6, and maybe CS5);
Even more seriously, you may:
6) Uninstall (ticking the box to delete the preferences), run the Cleaner Tool (if you have CS3/CS4/CS5/CS6/CC), and reinstall.
http://www.adobe.com/support/contact/cscleanertool.html