Instaled new SSD and now PC is wrecked

Recently I installed a new SSD to my PC to install some MIDI libraries for music composing. At first the SSD was not recognized so I switched the cables to prove that the problem was not in the motherboard or the cables themselves. But Windows ran into Automatic Repair, and It failed to fix my pc. After taking it to the experts they managed to make it work by replacing the BIOS battery. When I arrived home with my desktop pc, this message dropped: “reboot and select proper boot device or insert boot media in selected boot device and press a key”. Then I brought the PC to experts again and they conected every single part of the PC from scratch. It worked fine for a long time (almost a month) and one day a message dropped out that said something like: “Do you want to delete Windows’s old version?” I accepted, and some time later y was going to shut down the PC, when it suddenly said: Update and shut down. I clicked on “Update and restart” I left and when I came to see how it was doing: “reboot and select proper boot device or insert boot media in selected boot device and press a key”. It won’t even enter BIOS. Now I am about to go nuts and I don’t have a clue of what may be happening. Please tell me WHAT IS HAPPENING AND HOW CAN I FIX THIS!!! Thanks!

Instaled new SSD and now PC is wrecked

Recently I installed a new SSD to my PC to install some MIDI libraries for music composing. At first the SSD was not recognized so I switched the cables to prove that the problem was not in the motherboard or the cables themselves. But Windows ran into Automatic Repair, and It failed to fix my pc. After taking it to the experts they managed to make it work by replacing the BIOS battery. When I arrived home with my desktop pc, this message dropped: “reboot and select proper boot device or insert boot media in selected boot device and press a key”. Then I brought the PC to experts again and they conected every single part of the PC from scratch. It worked fine for a long time (almost a month) and one day a message dropped out that said something like: “Do you want to delete Windows’s old version?” I accepted, and some time later y was going to shut down the PC, when it suddenly said: Update and shut down. I clicked on “Update and restart” I left and when I came to see how it was doing: “reboot and select proper boot device or insert boot media in selected boot device and press a key”. It won’t even enter BIOS. Now I am about to go nuts and I don’t have a clue of what may be happening. Please tell me WHAT IS HAPPENING AND HOW CAN I FIX THIS!!! Thanks!