Hi Doug welcome to Techzonez.Since you removed your hard drive the bios probably needs to recognize your IDE drives.Enter you bios on boot up and go into your "Standard Cmos Features" or the equivalent.Some bioses will auto detect by pressing the F3 key.What you need for it to do is auto detect the hard drive,and cdrom drives.Make sure that the "Primary Master"is set to Auto under "Type".Hope that's it.