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HI  IS YOUR MOUSE THE OLD TYPE WITH THE BALL UNDERNEATH  IF IT IS  IT NEEDS TO BE CLEANED OUT BY TURNING THE MOUSE OVER UNDERNEATH YOU WILL SEE THE BALL POKING OUT  THERE ARE TWO ARROWS INDICATING THE DIRECTION IN WHICH TO REMOVE THE COVER WHICH HOLDS IN THE BALL REMOVE CAREFULLY REMOVE THE COVER TURN THE MOUSE RIGHT WAY UP AND LET THE BALL FALL OUT    TURN THE MOUSE UPSIDE DOWN AGAIN AND LOOK INSIDE THE MOUSE YOU WILL SEE TWO SMALL SHAFTS ONE RUNNING LEFT TO RIGHT AND ONE RUNNING FRONT TO BACK  FLUFE AND DIRT GETS ONTO THESE SHAFTS CARE FULLY CLEAN VERY GENTLY THESE SHAFTS WITH A CLEAN PAPER TOWEL OR CLOTH MAKE SURE THAT THERE IS NOTHING ON THE SHAFTS  AND THAT THERE ARE NO HAIRS ETC BY GENTLY BLOWING INTO THE BALL OPENING BEFORE REASEMBLY CAREFULLY EXAMINE THE BALL FOR BITS AND HAIRS WHICH MAY BE STUCK ON IT BY STATIC ELEC. WHEN YOU ARE HAPPY THAT THE BALL AND INSIDE THE MOUSE ARE CLEAN REASEMBLE BY TURNING THE MOUSE UPSIDE DOWN GENTLY REPLACE THE BALL AND REFIX THE COVER

THIS USUALLY FIXES THE PROBLEM

IF YOU HAVE A RADIO OR INFRED MOUSE IT IS USUALLY THE BATTERY WANTS REPLACING THAT CAN CAUSE PROBLEMS

CHECK THAT THERE IS NOT ANY THING IN FRONT OF THE RECEIVER ON YOUR COMPUTER

IF THESE SIMPLE THINGS DON'T CURE YOUR PROBLEM  IS A NEW MOUSE

HOPE THIS HELPS