. Dell XPS 8920 Boot Up message "Checking Media Presence)

After a Recent BIOS update a fault occurred and  this message shows on boot up.

>>> checking media presence...

>>> media present...

>>> start pXE over IPv4...

The PC will start eventually after a long delay checking each media presence in the list and not finding it..



It is trying to boot up on the network, using the PXE (Pre eXecution Environment) instead of "Windows Boot Manager"
PXE is one of the components of Intel's WfM specification. It allows a workstation to boot from a server on a network prior to booting the operating system on the local hard drive.

How to FIX

Enter BIOS SETUP,  press F12 and change the "order" of checking the above boot devices

Your motherboard can "boot" from several sources:
Ensure that top of the list is "Windows Boot Manager"

Enter BIOS SETUP, and change the "order" of checking the above boot devices.
Move the 'disk-drive' to the top of the list, and move the  'PXE' options below it towards  the bottom of the list.

F12 on a Dell PC.
You will only see in the Boot mode listing the option to boot from USB or DVD if they have bootable media fitted on start up.
This answer was on a Forum.
Dell XPS 8920 How to enable boot from emergency disk or memory stick?   
The XPS 8920 uses a UEFI Windows Boot Manager.
You must press F12 when you boot up and see the Dell logo. If you have a bootable CD/DVD in the CDROM drive or a bootable memory stick in the USB port you will see that device in the boot menu and you can select it from there. There is no boot sequence selection in the BIOS setup.