Hard drive problem with partition. Even after a new replacement drive.
After sending in my new 750 GB Western Digital Black Edition hard drive due to my partitions getting completely screwed multiple times. I received a brand new replacement 1 TB Western Digital Black Edition hard drive yesterday. Everything was working fine until I turned on my desktop on today and received the message "operating system not found". This is the same problem I got with my older hard drive. I tried everything, including creating a new partition using the command prompt on my old hard drive and I still had the same problem. I haven't tried anything yet with my new hard drive and I'm wondering what is causing my hard drives to do this? Any ideas of what could be causing this and fixes would be immensely appreciated. Thank you for your time.
-Not posting this from my desktop.
-Both drives are OEM and I do not have any discs with to run a diagnostics or repairs.
-I can not start up Windows in anyway.
-I still have my Windows 7 64 bit disc.
-My computer does not recognize my hard drive due to the partition being corrupted.