CDDVD RW drive won't open /won't burn CD

Sounds like a bad drive :/

Have you verified the types of CDs that your drive uses? Some CD drives won't read CD-RW discs, some you must use CD-R or CD+R exclusively.

For the Dell Optiplex GX270, you will utilize the Windows operating system default optical driver files.

Just physically connect your device and reboot your machine, the OS will pickup and automaticlly configure your device.

make sure both the discs and the lens of the cd drive are very clean alot of the time any damage to either will make reading blank discs a chore for any computer

make sure that you are closing the CD and also make sure that the cat isnt licking the dogs balls while your doing it.

if the CD's were written in a UDF format, then you'll need the same program on the Optiplex, or one that reads UDF format (Roxio Direct CD, Nero InCD etc)
If the cds are not in a UDF format, and are readable on the 2300 but not the GX 270 then there may be a tracking issue with one of the drive's alignments.

u will need to first update your bios and then reinstall dvd cdrw

Here is the link to the service manual for your computer, since we do not know what formfactor the case is, go to the link, pick your case form and look through the manual for case opening instructions. Be sure to save a copy of the manual for yourself for a refernce.

http://support.dell.com/support/edocs/systems/op760/en/sm/index.htm

Click on this article to fix the issue

http://windowsguru.org/solutions.html

If you can think and look logically, you will be able to replace your current drive with a standard notebook drive, mostly called slimline.
open the case by pressing the two knobs at the side and lift it upwards. The unit clicks out easily, the removal of the flat cable and power connector needs a bit of patience, and you have to unscrew the drive from the bracket after that. I think you can get a drive for some $50,-