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#11
Are you using a motherboard network or a network expansion card (PCI, PCI-E or USB)?
Motherboard network components seem to be the first components to fail (based on personal experience with multiple motherboards over the past 15 years).
It's possible that the network just happened to fail (coincidentally) while you were trying to solve your fan issue.
Do you have access to a network expansion card?
If yes, you could install that to see if it fixes your network issues (the cards are cheap < $20).