What it could be and sounds like to me is that your motherboard does not support a hard drive that big since its an older model. but then i could very well be wrong.
The other thing is if there is data on the old hard drive that you want to get off the most common causeof this is the bearings going in the disk. To fix this stick the hard drive in the freezer thats right i said the freezer for a day or two and that will 99% of the time allow it to work just long enough to retrieve the data. Not really relevent to your post but a handy trick to know none the less.
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