Now that you've upgraded to Yosemite OS X 10.10, you should further read
into the OS X Support site where that database covers most issues...
http://www.apple.com/support/osx/ -OS X support database
And reconsider another question, looking ahead, to post in Yosemite ASC...
OS X Yosemite - support discussions
There, you may be among others seeking assistance for a variety of issues;
since the official release of Yosemite out of beta status there are more users
of newest system version, & they aren't limited to Developer discussions, etc.
A new 10.10 topic thread may generate some same kinds of suggestions
the issue brought up earlier in this one, in at least one other thread in ASC;
so don't be surprised when or if replies to symptomatic (spinning ball, etc)
tend to go the same way. OS X Support topic articles can be found in the
above Database site, but also can be searched and recovered in a general
online search. If you use Google, for example, there are many Discussions
topics that will appear. Depending on how you word a search, more official
Apple Support articles can also be forced out of hiding, among replies there.
I'd be looking into the more traditional answers to the 'spinning beachball'
and spinning gear kinds of topics; several sites go back to earlier versions
of OS X. The topic articles in Apple Support itself have been getting updates
to cover by name Mavericks and Yosemite; some still say Mt Lion. The kind
of problem you faced could relate to a hardware issue in addition to software;
so troubleshooting should've included a bootable backup, so you could test
and see if the computer, or its components may have a hardware issue.
•Resolving common cause of spinning beachball...
http://www.thexlab.com/faqs/sbbod.html#Anchor-Res_Common_SBBOD
•Macintosh OS X Beachballs...
http://www.macattorney.com/rbb.html
Backup, time machine, restore...
http://pondini.org/OSX/Home.html
Some mac-related sites discussed it over several years, going forward
any links back to Apple database, no longer get you their articles.
About spinning beach ball of death - macworld:
http://www.macworld.com/article/1151583/spinningbeachballofdeath.html
A variety of FAQs about OS X...
some of these, and associated links
may be obsoleted in Yosemite OS.
http://www.thexlab.com/faqs/faqs.html
So, it is my opinion this thread has gone its course.
Sorry that of those who contributed advice earlier
did not compile it better for your purposes. And I
do not think a major upload of Console logs here
would help. If you can get Linc Davis to tell you
how to run a Unix command-line test, and then
post that result adequately, he may get back to
you. Not with a simple answer, but more tests.
Usually those kinds of interactions take time and
an etrecheck kind of exercise is not always helpful.
In a new topic thread, with details of hardware & software, previous history
of the situation, and what you tried; these may be of help to someone who
reads through and chooses which battle they may attempt to help resolve.
Into the Yosemite era, several items of older software not transitioning over
will likely need to be upgraded or replaced with something else. There are
new problems on the horizon because an OS X upgrade generally does not
resolve issues that may be based in hardware, or a mix of odd software, too.
In any event...
Good luck & happy computing! 🙂