Reading and writing (or a clean lens) is not really my main concern and/or issue here, but thanks Train.

Specifically, why can I not see either the old Plextor-Writer or the new LG-Writer recognized in the BIOS any longer?
(No, I do not have both installed at the same time)

Could this mainly be because I may have tripped something in the IDE port by swithing them from the master-to-slave positions and then back again to master position when that didn't work?

The new LG-Writer will open but doesn't even spin, at least, the old Plextor-Writer is still doing that and reading (but not writing).

Again, how do I get the DVD-Writer recognized and listed in the BIOS? I would like to do a clean re-install of the Windows 7 OS... but I can't do that if there is no DVD-Writer to place into the primary position.

Cheers.
Thanks for your patience.