My 10 year old custom built computer is crashing a lot. I would like to use parts of it so I’m not blowing tons replacing everything.

The link for pc part picker has my current case, power supply, and CPU cooler which should all still be good to reuse. The other parts in that build are just ones I picked at random so are totally up for change.

Any suggestions would be appreciated. I would prefer to keep it under 1000 CAD. If you want to see my actual current build I will put it in a comment.

Edit: I am running Linux Mint Cinnamon as of now. The PSU was replaced in 2021