Your new harddisk probably needs an 80 pin IDE cable to function properly. Are you using one of those?
Hm. The existing wires and plugs "just fit". However, there was a cable included with the drive, perhaps I'll try hooking that one up.

Also with an 80pin cable, it's necessary to put the master device on the end of the cable and the slave device in the middle.
 I'll try that, too, thanks.
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Tony Fabris