Thanks for the reply. Many people would have said nothing and just let the thread die in the hope that they would avoid showing any signs of embarrassment while having no thought for the people who had spent time trying to help.
Definitely. Fair play, OP. I would've said check the cables and try another port on the router as going from a gigabit to 100 Mb has to be either port or cable. Every day's a school day and holding hands up and admitting fault isn't easy but something we certainly need more of.
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Exceptionalism diminishes, cooperation enhances.