That driver issue. The 2400 came in some million configurations so this is why I rarely find the restore media to work. That is someone could have added the network cards and the drivers won't be on the Dell CDs or web site.
Think over who owned this and installed the OS and made changes and have a chat with them to restore this machine to operation.
I was able to reinstall the operating system from the cd that came with my computer without a problem. I then put in the drivers disk and attempted to installed the items that it indicates that I need for a Dell Dimension 2400. It will not install the drivers that allow me to access the internet. I tried to go to Dells website to download the drivers onto a CD using a different computer, but could not figure out how to do this. I am not sure what to do at this point. I would appreciate any advice Thanks so much.