Windows 10: Help! Two Crash Behaviors

I need some help. Back in 2021, I built my wife's computer from scratch. A few weeks ago, it started crashing. Although I've done numerous tests, the crashing continued, and has gotten worse. At one point a few days ago, it crashed 12 times in a single day. I have two crash behaviors that I'm trying to solve. BEHAVIOR 1: While playing Destiny 2 on Steam, the computer will randomly "crash" to a black screen--not the bios. GPU and system fans are still running. If the game is in windowed mode, I can still move other applications around for a minute or two before the whole thing locks up --

:)

 

all games crash!

I suggest you run rthdribl > http://www.daionet.gr.jp/~masa/archives/rthdribl_1_2.zip
Increase the window size step by step and watch your vga temps permanently.
What happens?
If it crashes, run at stock speeds as suggested before and retry.

P.S.: When your system locks, does the display signal turn off after a time?
Stuttering sound or no sound at all when freezing?
What X1800XT model do you own exactly?

 

help to remote connect

not sure how to use both programs u 2 suggested, i need more helpful steps thanks

 

all games crash!

ive watch my temps and both the cpu and gpu are within normal ranges. when it freezes it simply freezes the image and stops the sound. i must reboot to get back to windows.