I have had the same issue. When I try to PXE boot I am able to get to the WInPE environment but then it says that it cannot find any task sequences although I know there are. I was thinking it was an issue with the network card driver that is loaded into our boot image but I have tried a lot off different ones. I am still convinced that the driver is the issue but am not sure how to correct it. Any ideas would be appreciated.
I am using SCCM 2012 with PXE boot and built in LAN port option on the device.