GhislainG suggests the breaker is faulty and tripping at too low a load, so it should be replaced. BUT it can only be replaced with a breaker of the SAME current rating. A more likely explanation, though, is that the circuit you plug you computer into has many other items plugged in also so that the TOTAL current is now over the limit of a perfectly good breaker. You would have to move some of those loads to other circuits.