Laptops will get IP but desktops won't?

Hey everyone,

I have the strangest issue I have ever seen. I have been working service desk support for a year and a half at an oilfield company, and our receptionist had an issue with her computer, we re-imaged it via SCCM, and it crashed mid way through. We sent her a new desktop (Imaged it brand new right out of the box in Colorado and shipped to Arkansas, worked perfect) and it will not connect to the network / get any type of connection. The cable is plugged in and the NIC is lighting up and passing traffic, but there is a yellow triangle in the Bottom of the Taskbar in Windows 7.. when running the diagnostics, it says it cannot connect to the default gateway.

Set to obtain an IP from DHCP, not static. DNS is set to our DNS servers.

Desktop will work anywhere but in the reception area.

The real fun part - Any laptop will work in Reception. Just not a desktop. If you plug a laptop in everything works perfect, no issues. Plug any desktop in and it doesn't work. Is this even possible? Has anyone ever seen this before?