Note: Even though I know some lingo, I am completely computer illiterate. Reboot and Select proper Boot device or Insert Boot media in selected Boot device and press a key. I set out to build a new computer before and during the holiday season. My brother is the one that knows how to do anything, or install components on a computer. The night he put the computer together, he only had time to put it together, but not check to see if it ran properly. I tried it as a hopeful delight after getting off where I work, to see if it was ready for me to start installing mother board disks, and installing windows and other software, until I got the above message. I went into setup (I believe that is F2) to take a look at the BIOS. Everyone of the BIOS said, NOT DETECTED. Not the CDROM, not the HDD. The only thing that is correct at this point is the Floppy Drive not being detected, as I didn't use one for this build. After monkeying around with it, my brother came to a primary conclusion that my first HDD(Western Digital 80g), was no good. So he spared me his HDD, loaded with Windows XP. Finally it went to Windows' desktop, for about 10 minutes. And then, the Boot message came back again. My PC: CPU: Pentium 4 3.0gig 800 FB Motherboard: Asus 1333 FB LGA 775 HDD: Western Digital 80g HDD (Originally purchased) Memory: Two Corsair 1gig sticks of DDR2 ram I understand, that my being computer illiterate, I expect to be asked questions to help my question. I'll do my best to help you help me. I know one of you will suggest getting it diagnosed. I just haven't had the time and money for that. If nobodies suggestions help me, I thank you anyway in advance, and will just have to wait till, I can take it in...yuck.