When the computer is booting, the client mac addr. How to Resolve
The reason for this is that the ethernet boot feature is turned on and in the front row in your bios settings. You need to disable the ethernet or network boot feature from the boot options in the BIOS settings if you want to fix this problem.
If you understand from the BIOS settings section of your computer, go there and make boot 1st media boot first hdd boot disable. But if you do not know bios settings are important, do it with a know-how.
I will share a few pictures below about the subject but do not forget each bios is not alike.
I turned off the Network boot option completely from the boot options as shown in the pictures.
Important note that the boot options shown in the illustration may not be the same as yours. The BIOS screen appears differently on each computer.