When a CD-ROM drive doesn’t show up under My Computer, but does show the Yellow Exclamation in Device Manager, you can try this.
Open a command prompt with Administrator rights and run the following:
reg add HKLM\System\CurrentControlSet\Services\cdrom /t REG_DWORD /v "Start" /d 1 /f
Reboot and see if it now appears.
Oh, and to disable a CD-ROM, use this:
reg add HKLM\System\CurrentControlSet\Services\cdrom /t REG_DWORD /v "Start" /d 4 /ff
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