Dell Dimension 2400 motherboard
I think the model should have been on the case
...so that would have been a lot faster, lol
dimension 2400 files
Drivers & Downloads
your system may or may not support a larger hd, it's actually not all that large in comparison to the lba restriction (large block address). Rechecking info, the size of the new drive is currently not the issue.
Your bios may have an auto configure option for the drive, which I would hope it does. Going into it and checking, could enable the bios to see and set the system for it. Perhaps the updated bios will also address this.
and just for kicks, are you sure the hd was installed correctly?