go into the bios and reorder your boot sequence if you had an ssd fitted that was working and was primary drive before this happened might want to check connections and keep fingers crossed it hasn't kicked the bucket. Though if its a new SSD being installed could be just your boot sequence as i said
Boot with a live USB Linux or Windows run a test on the SSD in that might be lucky and its just connections also try a different SATA connection and lead as sometimes its just a dodgy lead if your lucky or just the board connection though that raises other issues then if it is the board
Obviously everyone else’s comments are worth doing first but if you are still stuck unplug all I/O devices and take out any disks that are in the Optical Disk Drive
keep tapping del key when powering up and in bios restore default settings then see if you can see the drive in boot options in bios. if you cant see your drive with operating system then I reckon its dead or sata cable or power loose or not plugged in