SRS -

I think Jon has it right, that you want an SATA drive.

The Dell Dimension 4700 User Manual (.pdf) shows your machine with two SATA connections and two EIDE connections (around page 72). The general description indicates you can install up to 2 hard drives and up to two optical drives. It appears to assume that only SATA Hard Drives will be used, and that the opticals will be the older ATA/EIDE kind.

(There's also a separate place to plug in a Floppy Drive.)

In principle, you should be able to install an ATA Hard Drive, but only if you remove one of the DVD drives; and you probably wouldn't want that.

The User Manual (probably same as on your installation CD) actually looks fairly good, at least compared to some I've seen; but it gives only one recommended action of significance when a hard drive isn't recognized (by Windows), which is to "scan for viruses." I'm not sure how you do that if the drive isn't recognized at least at a Command prompt.(?) (Apparently hard drives supplied by Dell never have hardware problems.)

John