-Hi, my name is Claudeir, I'm happy to help you!
I've read your entire case so far, and from what I understand, there is a hardware problem, either in the motherboard or in your SSD, you need to take a local technical assistance to do the hardware tests, even because, your PC is old, you said you were over 8 years old.
Taking technical assistance is the best thing to do, since we do not have access to the system, our hands are tied.
-Feel free to leave your opinion, marking as answered if the answer helped, or leaving more details so that we can continue the service, this is very important to us.
Graciously,
Claudeir