Logic Audio problem in Mountain Lion

Question

Running Logic Pro 9.1.8 on Mountain Lion 10.8.3, the core system audio crashes completely almost every time.  There are a few times when it will remain functioning normally and smoothly for an extended period of time, however, that does not happen often and it seems to be almost random.  Once the audio has crashed, the icon in the status bar becomes grayed out, no sound comes from the built-in speakers, nor from headphones.  After the crash, the system will seemingly function perfectly fine, of course without sound, until I try to quit Logic, at which point it becomes completely unresponsive and I have to do a hard shut down.  I've tried everything from Terminal command lines, clearing .plists, clearing crashes, starting in Safe Boot, checking if its an issue with my administrator account settings, repairing disk permissions, /sbin/fsck -fy command line in single user mode, all to no effect.  It seems like this also happens when I use Photo Booth (the audio crashes).  Several times after starting the system up again after doing a hard shut down, I have found that after the Apple logo remains and the spinning wheel icon has gone, the single-user mode screen (black with white command line text) appears on the left side of the screen, as though it is coming through the regular start up screen, with every new line of text. 
Every now and then I have seen a message pop up when opening Logic stating that there is an error with the core audio driver, with a code that I believe is something like "2549" (I'm not sure if this is it, it hasn't happened in some time).
Any help regarding this would be appreciated, as I believe I have looked everywhere on line for an answer, to no avail.

Answer 1

Hi Pancenter,
Thanks for your reply.
And I understand you have to ask those questions, and no I have not installed any new software from any such sites, I have the most basic form of Logic Pro 9, with no plugins, extras, or anything. 
I am using the Mac audio interface, at least I believe I am.  It is the Core audio driver, nothing more. 
I do not have the install DVD, unfortunately, and I have recently wiped my Mac clean and reinstalled OS X 10.8.3 from a bootable flash drive. 
I HAVE installed two 4GB RAM in the two slots, which seemed to be working fine before the upgrade to Mountain Lion, and I believe they have the specifications necessary to be run on my computer, however, I can always double check, just to make sure. 
I have reinstalled 10.8.3 several times, to no avail, unfortunately.  It does seem, however, that the issues have come about only after installing Logic (i.e. audio issues), though, I do have many other issues, such as unexpected application crashes, that were present before the installation (after wiping my hard disk and resinstalling OS X).  There was a point where, I completely forgot what I did to achieve this, however, before I completely wiped my hard disk and reinstalled Mountain Lion, I performed some actions, whether it was deleting .plists, caches, booting in safe mode, that fixed ALL of my issues, including those relating to app crashes, and it wasn't until I decided to restart my computer one night, that, when the system booted up again, all of the issues returned, immediately.  As I said, however, I cannot remember what it was that I did.  I have already tried deleting .plists and caches, etc., still, to no avail.
I apologize if I am replying late, I'm currently a student so with all of my course work, it can be slightly challenging to check in regularly. 
Thank you for the reply.