Brad,
I don't know if this applies, but earlier this year I bought a dell workstation sim to what you have. It was defective. It kept shutting itself down. So did the 2 replacements. All were returned. They were able to get the last one running ok after replacing several defective parts, but I'd had enough of such shoddy machinery.
As I said, it may not apply. I've had a number of delll dimensions over the years which have been fine.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"