*Please note this is a non-technical reply ie. I know nothing about computers other than that it is very temperamental.*
Switch off computer, and check everything is plugged in, then switch it back on again.
(Works for me...
)
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein