Dying psu?
Dying psu?
he seems to be suggesting moving pins 4 and 5 to initiate the PSU without connecting it to the PC, then using a voltmeter to verify the 3.3V/5V/12V rails are functioning properly.
Additionally, since it's a 9-year-old GPU, it might be showing signs of failure. Do you have another system available for testing? This would help confirm whether the issue lies with your setup or the GPU itself.