I had a stock machine running windows 7. I built a computer for myself and I hardly use cds so when I needed to install windows 7 on the new computer I simply removed my cd drive from my old computer and put it in the new one. I assumed that since the os is installed to the hd that the computer would still run but it does not . I already installed windows 7 on the new computer but when I went to boot my old pc up it says no operating system. Do I just need to buy a new cd drive? Or do I need to buy another copy of windows?
Are the CDROM and hard drive IDE or SATA? Common problem with the IDE type drives is that they are configured in a master/slave configuration (jumpers on the drives) - you will need to configure the hard drive as a stand alone drive.
Second - does the BIOS recognize the hard drive? Are there any error messages when booting?