I took out my original 1TB hard drive in order to test a different 500GB hard drive. Well, after I put back in my original 1TB hard drive, my computer apparently won’t recognize my 1TB drive anymore. It keeps giving me a message to put in a valid boot media or something to that effect. After getting this message, I put back in my 500GB drive which works fine. What can I do about my 1TB drive? Apparently, the problem is with the drive since my 500GB is working fine. I just purchased the 1TB drive a few months back.