games are crashing, PC sometimes goes black with fans on

[safe patio]

500w PSU from several years ago is likely no longer giving that full 500w. My guess is power problem. You can find clues by looking at windows system log, Event Viewer. Something like occt or furmark+cine bench to stress the system might be able to reproduce the problem

Also maybe don't be a dickhead when asking people to help you for free

Your passive aggressive addition from 8:14 is the offensive part. People aren't getting paid for this. Be patient.