Generalfeldmarschall zur Luftschiff Abteilung
The BIOS battery can last quite sime time.Change the motherboard battery?
The problem is, the capacitors can degrade over time, like cheap batteries and they can be the culprit behind a stored PC failing to operate.
In the world of electronics, the electrolytic capacitors are usually the cheapest a manufacturer can find and are the main reason behind a three year lifespan of TVs, Monitors, power supplies and MoBos.
I typically replace the OEM caps (that cost about .02 cents per unit) with high-end caps (that cost about .15 cents per unit) and have yet to see any of my equipment fail.
I had a new KDS LCD monitor fail after two years (back in 2008), replaced the five caps in it's power supply and it worked flawlessly right up to when I put it in storage back in 2019 - a span of 11 years.