boofhead :
A couple of simple things to try :
As well as setting the jumpers on the new Hitachi drive have you checked the jumpers on the exisiting drive ?
Some Hard disc drives will require a jumper in a certain position, or maybe no jumper, when they are set as the Master drive with NO slave, and then need a different jumper setting when they are the Master with a Slave present, or even two jumpers if the Master is an ATA drive and the slave isn't - there are all sorts of combinations so check the labels on both drives which should say what is needed.
Check to make sure you are connecting the drives to the correct location of the ribbon cable - the Master should be connected to the plug on the end - often coloured black, with the Slave plugged into the middle connector - often coloured grey.
Also check the TYPE of IDE cable you are using and the type of Hard drive - for example your Master might be an Enhanced IDE ( EIDE ) using a 40 conductor IDE ribbon cable, while the new Hitachi could be an Ultra ATA and might require the 80 conductor version of the ribbon cable - both types will physically plug into the Motherboard and drive.
Check the drive manufacturers web sites to make sure they are compatible with each other.
