You didn't say if the hard drives were new... Sometimes after a couple of years, they will not start up fast enough if the BIOS is set to "Fast Post", "Quick Power ON Self Test" or a similar BIOS Features Setup setting. The added power drain of a high speed CD-ROM "might" have tipped the scales against you. (On both computers...) I like the added security of a full POST Self Test. Rick Glazier ----- Original Message ----- From: "James Edwards" <[log in to unmask]> >. However, over the past few days, on about every 2nd boot the >computer issues an error message about "Invalid Boot Media" and can't >continue. A hard reboot and the computer starts up and everything is >fine. I might have thought that the Hard drive was getting flakey at >the same time as the install of the CD (a coincidence), but not two >on separate computers. PCBUILD maintains hundreds of useful files for download visit our download web page at: http://nospin.com/pc/files.html