|Yours is an older model - Intel 85x main chipset. |
Older bioses may not show the CD drive as being detected by the bios in the bios Setup, but if the drive does not show up in Windows it's definately not being detected by the bios.
However, I found some of the bios info about your model - it doesn't show all the details, but if the cd drive is being detected it should show up in the list of drives on the summary screen - the first screen you see.
If the optical drive does not show up in Windows, you probably have a connection problem to it, assuming the Intel 85x main chipset drivers were installed.
They were if you still have the orginal Dell software installation.
If you don't have that, your CD drive may not be detected in Windows until AFTER you install the main chipset drivers -
Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, USB 2.0 if it has it, and hard drive controller support. If you have a generic system and have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often DO NOT have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.
You should be able to see you can select CDrom or similar in the Boot Sequence (select it and press Enter to open it) settings in the bios. If it isn't present already, you should be able to select it from a list that pops up when you click on something there.
That should be floppy drive first (at the top), if you have one, CD drive, then hard drive, if you want to be able to boot from the CD drive.
I have found that in many older bioses, if the CD drive is listed before a floppy drive, a bootable disk in the floppy drive will NOT be recognized as bootable while booting.
Many older bioses are incapable of booting from a USB optical drive or USB flash drive - you have to be able to set the boot order or similar so can boot from a USB drive first, and the USB drive may not show up in the bios as detected by the bios but it should show up in Windows.
Remove or replace a CD/DVD drive.
The manual assumes the drive is jumpered CS - cable select.
It could also be jumpered master.
If you have two drives on the same data cable, both must be jumpered cable select, or one must be jumpered master, the other slave.
If you have it on the same data cable as a hard drive, some hard drives have two ways master can be set e.g. master (single) or similar, for when it is by itself on a data cable, or master (with slave), for when there is a drive jumpered a slave on the same data cable - in most cases the secondway must be used in order for both drives to be detected properly (or both can beset to CS).
It is common to un-intentionally damage IDE data cables, especially while removing them - the 80 wire ones are more likely to be damaged. What usually happens is the cable is ripped at either edge and the wires there are either damaged or severed, often right at a connector or under it's cable clamp there, where it's hard to see - if a wire is severed but it's ends are touching, the connection is intermittant, rather than being reliable.
Another common thing is for the data cable to be separated from the connector contacts a bit after you have removed a cable - there should be no gap between the data cable and the connector - if there is press the cable against the connector to eliminate the gap.
80 wire data cables are also easily damaged at either edge if the cable is sharply creased at a fold in the cable.
Try another data cable if in doubt.