When I turn on my Lenovo Thinkpad, it says PCI LAN: IBA GE Slot

Set up the PXE boot server with the MAC addresses Plug the Ethernet cable into the adapter's port Power on the server Press the F2 key or the Control-E keys

Note that IBA GE Slot or IBA CL Slot precedes the Intel Boot Agent device names in the Boot Option Priorities menu Ethernet port 1

iba ge slot This IBA GE SLOT 00C8 V1327 is the mechanism for booting via the network So, the solution was to look at the BIOS menu for Bootable devices,

iba cl slot PCI LAN: Model IBA GE Slot 0200 v1250 ->No valid operating system 6 -USB HDD -> Device not found 7 ATA HDD1: -> Device not found Excluded