The Compaq Armada E500 notebook was working one minute. Next time it was booted up, screen started flashing, and any key you pressed it would just beep. Final message showed up in the middle of the screen - PXE-E61 Media Test Failure Check Cable.
I have a ACER lap top that has error message PXE-MOF: Exiting Broadcom PXE ROM and PXE-MOF: Media Test Failure. Check Cable.