|Presuming this a is a new drive and that is OK... then the drive is either not found - because you haven't told the bios what it wants to know. There is some critical bumf/info you can manually enter, or you set the bios to auto-detect the drive...|
What make drive?
What bios do you have on the system; there will be a little bit (a few lines) of info on the screen when you boot up initially - usually near top left?
It will say something like Phoenix, or Award, or AMD etc.?
Equally... you have a (Primary) Slave device attached (a zip-drive). How have you got this zip-drive and hard-drive connected to the ribbon; and how are the jumpers set for each device?
Perhaps - power down etc. (remove the mains-cable too); open the case; look at the hard-drive and see how the jumper is set; then check the zip-drive similarly. Also note where each device is on the riboon connector.
Then post back.
You could also initially disable the zip-drive - remove it from the ribbon and remove its power-connector too. Then ensure the hard-drive is set as Master - NO SLAVE; and connected correctly on the ribbon depending on which method you use (cable-select or Master/Slave setting).
Some tutorials on installing/configuring a new drive etc.