I've seen enough electronics repair videos that it seems the default for troubleshooting absent other conspicuous damage is to start checking the electrolytic capacitors.
There was a time when Gigabyte started selling more robust motherboards with quality capacitors that would last much longer. After seeing so many old motherboards dying from blown capacitors I was very happy to get one. Those motherboards so far held the full length of their meaningfull life until the CPU just got too slow to use for anything. Still try to look for that type of capacitors when I build new stuff for friends and family.
The Gigabyte line is called "Ultra Durable" and have solid capacitors instead of the electrolyte ones.
The Gigabyte line is called "Ultra Durable" and have solid capacitors instead of the electrolyte ones.