JorgeB, Thanks for taking a look at this. Please let me know if you need additional information. I created new USB boot disk with 7.3.1 and still the machine reboots on Unraid boot. I have attached a video starting with the UnRAID selection screen to the first screen of machine POST.
UnRAID 7.3.1 Fail.mp4
After upgrading from 7.2.6 to 7.3.1 my machine gets part way through the boot process and automatically reboots. After making a copy the USB boot drive i copied the 'previous' folder back the root on the USB boot drive and now able to boot on 7.2.6. Not sure what is going on but I have to diagnositic logs but not sure what needs to be uploaded for someone the review. Thanks