Mac Pro on 10.6.8 freezes after startup

Question

Since updating to 10.6.8 my 2009 MacPro will freeze after startup when opening finder, safari and itunes (so far). No beach ball and ForceQuit doesn't work. Resolved only by a hard shutdown with the off switch and restarting.  Never a problem on restart. This problem seems identical to that described in an archived discussion (after an update to 10.5).  Refer: https://discussions.apple.com/thread/2018112?threadID=2018112  .
I have followed those suggestions without success:
-run AHT and no issues found
-run disk utility to verify and repair permissions
-used Rember to check memory and no issues
Grateful for any suggestions; thank you.

Answer 1

It means that a third-party system modification you installed is causing the problem.
Reboot as usual (not in safe mode) if you haven't already done so. Don't launch any of your usual applications. Launch the Terminal application, copy or drag -- do not type -- the line of text below into the window, and press return:
kextstat -kl | awk ' !/apple/ { print $6 $7 } '
Post the lines of output (if any) that appear below what you just entered (the text, please, not a screenshot.)
Next, do the same thing with this line:
sudo launchctl list | sed 1d | awk ' !/0x|apple|com\.vix|edu\.|org\./ { print $3 } '
That's one line, not two. You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning.
Next, this command:
launchctl list | sed 1d | awk ' !/0x|apple|edu\.|org\./ { print $3 } '
Again, one line. Finally, one more:
ls -1 /Library/{InputManagers,StartupItems}
Remember, this is all drag-and-drop or copy-and-paste, whichever you prefer -- no typing, except your password.
You can then quit Terminal.