At what looks to be a decade old, the old electrolytic caps are a shadow of their former selves. This could be a motherboard issue or another old part. Try thermal paste on all other heat sinks. Be sure the case cover is off and a fan pointed at the open case to see if anything changes.

Age is not your friend on this one.

Try adding a Web Speccy since you didn't tell what you had. Read https://www.piriform.com/docs/speccy/using-speccy/publishing-a-speccy-profile-to-the-web