The Intel support page (scroll down to almost the bottom of the page):
describes this error message:
Error "PXE-E61 Media Test Failure" at Boot
The error PXE-E61 Media Test Failure can occur at boot, if all the following are true:
Boot to LAN is enabled in BIOS Setup.
A network cable/connection is not present.
Network Boot is in the boot order before a present boot device.
To resolve this, remove Boot to LAN from the list of boot devices in BIOS Setup.
End of Quote
Open your BIOS and check to see if Boot to LAN is in the startup order. Then remove or disable it.