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Researchers warn that Windows 11 restrictions could send 240 million computers to landfills
(www.techspot.com)
This is a most excellent place for technology news and articles.
Unfortunately it isn't always as easy as that. Depending on what broke on the old computer, finding the right replacement part may be a nightmare. You can often find old CPUs on eBay for dirt cheap, but the catch is that there are close to no motherboards available, and the ones that are are way too expensive to be interesting. Moreover, it isn't always interesting to run old hardware for something that is on 24/7. My R5900X NAS sips 75W... At idle. 130W at full power. Depending on your electricity price, it could be more interesting to buy newer, more efficient hardware, than using older ones.