@Jerialone
Given the date of your post, I would have expected someone to respond to it before this -- but since that has not happened, I will take a shot at it ...
You mention the drive has been "installed" -- but you failed to describe WHAT you did to "install" it.
If you just put a blank drive into a PC, it will not boot from it because the boot loader partition and associated files have not been properly loaded onto it.
Also, if you just copy the OS from your old drive to this SSD, that also will not work because copying the OS does not properly loade the boot files.
I am a volunteer and I do not work for, nor represent, HP