A Grade 12 student of a government school was admonished for turning off the school computers' power switch and told to behave by a teacher. The boy promptly gave the teacher 'a hard' slap', an official said. The student had also behaved badly earlier but was allowed to continue after he apologised. Police say the school has not filed a formal complaint in view of the boy's future, but the incident has been reported to district education authorities. The teacher was sent to a government hospital where she is being examined for possible internal injuries, as the blow landed near her left ear.