Hi, James0221!
Welcome to the Microsoft Community!
I am very willing to assist you.
I understand that your current situation is that after installing your GPU, the screen freezes when using VGA to output the video signal.
In this case, have you just encountered this situation recently? Have you recently updated your graphics card driver or installed any Windows updates or other software?
According to what you had tested, we confirm that your CPU and GPU are intact. It may be a driver conflict or a compatibility issue with your monitor output protocol.
Now you can use it normally when you use the DP cable to connect to your monitor after installing your GPU, but it freezes after VGA to Windows logo loading.
If you try using DP to VGA output signal when installing your GPU, I think this is also an alternative worth considering.
Thank you for your understanding and support!
Best Regards,
Yang.Z - MSFT | Microsoft Community Support Specialist