Sik, as soon as you can get your PC up and running, run the SMART software on that Hitachi HD to make sure you didn't get ripped off....there's been reports of some sellers selling them as new when they are actually refurbished....running the software will show you how many hours of use is on it..
Also, the date listed for manufactured will be a good tell tell sign, if it is over 2 years ago
Hope this helps
TC