The police were alerted by relatives who had become worried about the man's mood.
He was arrested in his home before he had time to act against the other man.
According to the witnesses, the accused man had felt offended and cheated due to a computer affair between the two.
He has denied crime in police interrogation.
Several witnesses will tell at the trial about their contacts with the man and that he said, among other things, that he would kill the other person.
The man is also charged with minor drug offenses.