Computer not detecting my hard drive

Hi all,

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. 

Hello, try using another SATA cable or another SATA port to connect the 1TB hard drive. If the problem continues, connect the 1TB hard drive on another PC as secondary and run a DLG test. Check the link below for the steps, 

How to test a drive for problems using Data Lifeguard Diagnostics for Windows