Hi,
You have open your laptop and clean the key bud or replace the bud thats gives spring action to your keypad...
Removing and cleaning is very simple process...
For effective gude , please refer the link below, that may provide you efficinet solution in opening and cleaningf the keyboard
http://www.insidemylaptop.com/take-apart-compaq-presario-m2000-notebook/
ENJOY! RATE THIS SOLUTION
RNJ VINOD KUMAR
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