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!!!Those messages could mostly mean that you need to reseat INTERNAL components on your mobo and making sure they are well connected. The last two messages I could recall were the RAM modules and the other one on a WIRELESS network card, both on LAPTOPS. But check also all cables loose or damaged. Since the Hard drive is not detected, it might be another issue as posting previous events that led to this state would help determine the problem.