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Message: <blockquote data-quote="pigoo3" data-source="post: 1616555" data-attributes="member: 56379">This is great news…since you don't want the problem to be processor/logic board related.  As soon as I read your recent discoveries…I was thinking the same thing (before I read all of your post) that it could be the computers "hard drive cable" or also referred to as the "SATA cable".I know that in your initial post you mentioned that the problem (computer froze) happened while doing the OS upgrade from Mavericks to Yosemite.  But this must have been purely coincidence.  This "freezing" could have happened while doing anything…it just so happened while doing the OS upgrade.It certainly sounds like it could be the hard drive cable.  And replacing it is probably the next thing to try.You can go to ifixit.com to find the replacement procedure for your MacBook Pro model.  And a place to get the part is Powerbookmedic.com (or eBay)…whatever works best for you.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />- Nickp.s.  Some great troubleshooting you did there!  Nice job!!!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?