paste following code in Notepad ans then save it with name “regdefault.reg” (including quotes). Then run the file and your settings will be reverted back to original:
PXE-E61: Media test failure, check cable PXE-M0F: Exiting PXE Rom No bootable device -- insert boot...
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PXE-E61: Media test failure, check cable PXE-M0F: Exiting PXE Rom No bootable device -- insert boot disk and press any key