I've tried trouble shooting with the various suggestions, and none have worked since I don't have a CD Rom any longer. When I check the BIOS settings, there isn't a hard disk listed (it says none). It won't let me highlight on the Hard Disk in the Phoenix Bios Setup Utility. My son got a hold of my computer today, and I am so worried I've lost all the date on this computer. These are the messages: PXE-E61 Media test failure, check cable, PXE-MOF, Exiting PXE Rom, Operating system not found. I am not sure how much sense I'm making; I'm new to this. HELP!!!