Update On site technician installed the replacement MB today. This did not resolve the problem. Onsite technician talked to Dell Support. They could not resolve the problem and Dell Support required customer to call Dell Support. I called and Dell Support could not resolve the problem and say replacement of MB caused problem with hard drive. Of course this was after starting all over with another tech and the troubleshooting.  Of course tech assures me that they will ensure it is fixed and up and running. Of course I was ensured that the MB would fix the issue and reinstall the OS. Now waiting for another on site service for hard drive replacement. I am totally frustrated with this purchase and service.  Update =Resolved  After completing troubleshooting, a DELL-Cares agent setup service.
New 7610 is unable to boot into Windows after attempting to do OS reset through Support Assist. The reset process started than rebooted back to Support Assist screen and just stayed there without finishing. Once turned off it wouldn't boot up. I made USB OS Recovery for service tag with Dell OS Recovery Tool. Reset OS with the Support Assist OS Recovery USB begins but stops partway through. Somewhwere between 20-30% during downloading step. Gives the following message "We are missing some of your system details needed to finish the restore. We are aware and working to fix the issue. You can try again later, or please go to [URL] for immediate support." Only option given is a button to "Cancel & Close". I called tech support and the tech had me try different things without the USB (restoring BIOS defaults, turning off/on and some other steps I don't remember) Nothing worked and it would get stuck in an endless loop of turning on then off then on. Then the tech set up service for a motherboard replacement. Still waiting to be contacted by the service tech for the in home call. The new motherboard is waiting for pickup by them. No word on when the service will happen. So far waiting 5 days. Looking for advice on other things to try. Only boots to "one time boot" without USB and to Support Assist with USB. No hardware issues found when scanned. Does this brand new laptop (only have had it since 12/1) really need a new motherboard? Any help for me?    
Dell Inspiron 7610 Unable to Reset OS with USB Support Assist OS Recovery