Replace the keyboard and while inside clean it with the usual canned air?
Bob
I have a Dell Inspiron N5040 that has issues with its keyboard. It runs Windows 7 Home with 4 GB ram, and is stock. It will repeat typed keys if they are pressed at a rate of more than about a key every five seconds. This problem only occurs when using the internal keyboard. I have tested it using an external Dell keyboard. It also has issues with intermittent shutdown. I do not know what causes the shutdown, and the only condition I have managed to find is it happens less often under Linux than Windows. Does anyone have any ideas how to fix this?

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