Note: This is a completely different issue. You have an IP addy that the NIC received, but you never get to automation to see the IP addy you "missed" last time.
The other comments about checking for UEFI and such are correct.
Also, in 7.5, under Settings | Deployment | NBS General Settings, you need to enable "respond to ..." for that computer type. For instance, if it's a new computer, and the "respond to unknown computers is NOT selected, then PXE will NOT respond to this system, and yes, you'll get no PXE response. This is commonly overlooked as requirement. IF you have to change this, be sure to select "apply immediately" at the top.
GL!