My computer WIN7 system, recently found that the CD-ROM logo is gone, and there is no CD-ROM option in the device manager. What happened?

Double-click ATA channel 0/ 1 to open it, and check whether there are ATA devices belonging to the optical drive. If there is no optical drive, the connection may be incorrect. If possible, the CD-ROM drive is broken. You can connect the CD-ROM drive to another computer to see if it works properly. Plug in the power and data cable of the CD-ROM drive yourself.