The issue is solved. I tried with another M.2 SSD drive alongside the old HDD, and the computer recognized both. After that, I removed the old HDD and replaced the SSD with the one I bought (the one I was having an issue with), and it has been working flawlessly since then. I do not have a clue what was going on, but it appears the second SSD "flushed" the mother board, and now things are working just fine with the SSD that was giving me trouble. Thanks for all your help and useful suggestions.
Hi thereI recently bought a solid state drive (Crucial M.2 P5 1 TB) to replace my hard drive. I followed the instructions on the Dell Optiplex 7060 SFF Service Manual, the Crucial website SSD replacement guidelines, and a couple of videos. When I remove the old hard drive and put in the SSD, the computer did not turn on. When I put back the old hard drive, I was able to power up the machine. I still have the option of trying to install both drives at the same time and see if I can install Windows on the SSD... Has anybody experienced a similar issue? Any suggestions?  Thanks in advance
Optiplex 7060 SFF SSD not recognized