sandbox violation unable boot - powers down

iMac late 2009, 16GB RAM, El Captain. I have been trying to diagnose a problem over the last couple of days that started on my iMAC. When the iMAC reboots, it runs for a little while and then shuts down. I have tried the following options:

1. SMC Reset

2. PRAM Reset

3. Safe mode boot

The above steps result in the same issue.

Booted in recovery mode and ran First Aid on my HD and no issues were identified.

Booted in Single User Mode and ran fsck and everything reported ok.

Ran AHT and no hardware problems were reported.

Booted in verbose mode and everything looks okay and then it starts printing a Sandbox Violation launch(d) deny over and over. It is printing to fast to see what the initial problem was and I don't see where i could stop the scroll. Unfortunately, when it gets done it shutdown so the log does not remain on the screen for review.

I have tried looking for the verbose log using dmesg and syslog using the recovery terminal and via single user mode but the last entries are from days ago. I would have thought that the verbose log would have been appended to the syslog.

Looks like some type of conflict with files but not sure of the exact cause. Wish I could see the entire verbose log. Any have any ideas on how to stop the verbose output scrolling or find the log from the failed boot? Any help would be greatly appreciated.