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Re: laptop charger, would it make a difference in output of amp.
Have you got a volt-meter you can use to check if the charger is working?
If that is ok then I would suspect the power connector - best thing in that case would be to get the shop that did the repair to have another look at it - if they only fixed it a month ago they 'should' do it again for free, but unless they gave an explicit guarantee on the repair that isn't necessarily your 'right'.
I hope you get it sorted..
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