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Redditor finds heavy block of iron shavings inside cheap PSU, also appears to lack safety protections
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
It's a convenience factor I think. Send the whole thing away and it comes back working. Opposed to having to find the faulting hardware and determining the type of fault and dealing with the vendor for that specific part in hopes that it's actually the issue.