My guess is IDE, since SATA drives require no changes on the drives' back panel jumpers to operate properly.
That said, if the drives are IDE, I suspect you have the drive jumpers set incorrectly. The easiest way to set the jumpers is to set BOTH drives' jumpers to the Cable Select position (see your documentation for the drives to determine where the jumpers should be set). In that configuration, the master drive - the one you boot the computer from - is connected to the end of the IDE cable, and the slave drive - the second drive - is connected to the middle connector.
Hope this helps,
Alrite I have a Alienware Desktop computer running Windows XP for a while now and been having a problem when I installed another hard drive on it. Every time it starts up it freezes on me. I have started it up without the hard drive and connect it later on and it works perfectly. Please help.