My DVD drive has no jumpers unless i need to remove the metal plating to see it.
Put your harddrive back to cable select, as this is how they all are.
Verify you cable connection, as some cables are direction aka the longest piece of wire to one end has one end at it this plugs into the xbox itself, and hopefully your new cable has a little tabe that must sit in one direction if not you will need to use teh red wire and put it on side of pin1 on xbox ide connection.
Then use middle connection for dvd drive, and allign red wire to pin 1 as well, then last cable same thing for harddrive.