Can you format an external drive while connected to a laptop? Yes.
"All I have is the Dell REinstallation/repair disk," Is it for the Dell Dimension 2400 you want to put the drive in? You won't be able to use it if it is for a different type of machine.
It sounds like the drive is faulty, I would download a program from the drive manufacturer and check the drive with that.
If your OS CD is not bootable (it should be) but is OK to use with the machine, download nlite
http://www.nliteos.com/
slilpstream it with SP3 etc and nlite will make it bootable.
Bob_180_Bob
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