Windows CDROM not regognized on computer

I have 2 CDROMS and 2 hard drives. On one drive I see both CDROMs on the computer and they both read and write. On the first booting drive I only see 1 CDROM. So far I've tried Mr. Fix It and that doesn't seem
to recognize the drive. I've also edited the REGEDIT and removed the filters and that does not work, I've copied the registry from the drive that recognizes both drives onto the one the doesn't and that doesn't recognize it. It doesn't even look like it's powered when I'm on that drive because I can't open the door by pressing the eject button. I tried adding a device but it doesn't recognize it to be added. Device manager doesn't show it listed. Do you have any procedures that I could try please.
The CDROM is a HL-DT_ST DVDRAM GH24NS90.

WaltB32 said:

...I've copied the registry from the drive that recognizes both drives onto the one the doesn't and that doesn't recognize it. It doesn't even look like it's powered when I'm on that drive because I can't open the door by pressing the eject button.

Little confused. You boot on 1 or another hard drive with different or same OS?
Not ejecting may indicate it's being in use or trying to use.
Hope my confusion doesn't confuse you.

I have 2 hard drives both with Windows 7. One sees both CDROMs the other sees only one.
Also there are no lights on the CDROM drive indicating power.

I'm sorry, Walt, but I still don't get it. You have 1 computer or 2? Are you dual booting?
That's usually for 2 different OS. Or are you swapping 1 drive for the other in 1 computer and both
have same W7 installed on both drives? If yes to this, see THIS. Is this right, left or wrong?
I'm trying to help but you are not detailing the whole picture of what and how you are doing it.
Anyway, read that link I supplied and see if anything in it is what you are trying to do.

bigmck said:

Just to get the right terms, ROM means "Read Only Memory" so it the CD Drive writes, it is not a CDROM

CD in the CD-ROM, CD-RW or DVD or DVD-RW drive. My DVD-RW is also a CD-RW. CDROM works too.
(CD DVD RW Burner/Re-writer)
I know and I know you know but how can suggestions help Walt when it is not clear what he has?
Maybe some important info to follow eventually.
OH, and I'll have 2 Big Macs to go.

bigmck said:

If you don't have any suggestions, no need to post.

There was a suggestion in that post. And I want and trying to help Walt too.
I was just having fun with you. Is that not allowed here? Take it easy.