^^^ what he said. Hard drives and optical drives being on the same IDE cable is basically one HUGE taboo.
failurbydesign: you don't know what jumpers are? ..... 21 must be the new "old" now... lol, j/k. it's the little plastic square on the back of the drive with a small bit of metal going across which is used to connect two pins on the back of the drive. when you look at the back of the drives, there will be the plug for power, the IDE cable, and then there should be a set of..... i think like 6 or 7 pins, with said little jumper. on the label of the drive it will show a diagram for where the jumper should be for whatever position you want it to be on (Master = primary drive/boot drive, Slave = secondary drive, Cable Select = determined by where the drive is on the cable). i usually set them to master or slave.... not a fan of trusting Cable Select.