Dell boot up client MAC addr:00 guid:ff and DHCP

Workaround:

Boot into the screen has "press SHIFT-F10 Configure ..." prompted the screen has 3 seconds to pause, at the same time quickly pressed "SHIFT+F10" into the network card settings of the Blue interface, there will be four operation options:
Item 1th: Network Boot Protocol default selection: PXE
Item 2nd: Boot Order Selection: Rom Disable to turn off "DHCP ..."
Item 3rd: Show config message select: Disable to turn off the "SHIFT+F10" hint
Item 4th: Show Message Time default selection: 3S

Set up, press F4 save exit, restart the computer can.

NOTE: Integrated NIC solution:
Press the DEL key on the boot and enter the bios->integrated peripherals->onboard LAN Boot Rom to Disabled.