Its hard to know whats going on. It could either be the HD controller on the case or the drive itself. I assume that you're not interested in simply returning the drive, and are okay with invalidating the warranty in order to recover the drive. If not, then your best best is to work with Seagate and/or retailer to get a replacement.
If you're more interested in the data, the safest and most expensive way would be a professional data recovery service, typically ranges from hundreds to thousands of dollars.
If thats not in the cards the next thing I would do is try some data recovery software on the current drive. Try googling 'GetDataBack' from Runtime software which has a free demo to see if your data is accessible. If you can see the drive at least, there is hope. If not, try changing the case (see below) and then rerun the software to see if the case is the issue.
My next suggestion would be to find another case and move the HD into the new case (I assume the drive itself is a 2.5" SATA, but you'd need to confirm this). This is actually very simple to do assuming the Seagate case is not sealed. My experience has been that most of them can be opened using standard computer tools. The drive itself will be a typical format and will be easily transferred to a standard case (from Memoryexpress or similar online source).
Hope this helps.
Edit: Rathji's suggestion for testdisk is a good one, although in my limited experience a bit harder to use
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