Keyboard and mouse not working in dell laptop [Closed]

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Hello,

my dell laptop isn't working keyboard and mouse suddenly.when i using my computer, mouse can't use in double click.It can only use right click on icon that i have to choose.And in excel,can't do cursor on cell that show research icon only.so how should i do this for.i didn't recognize that i press any key when i used.i hope someone may help for that.

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