Increased use of technology for instructional purposes has Caused some debates about ethical and/or moral use of computers. All teachers, as practitioners of ICT in learning settings, must feel responsible for educating students on "what is right and what is wrong?" of computer use. This study aimed to determine prospective teachers' unethical computer using behaviors at a faculty of education in Turkey. The results showed that the participating prospective teachers are sensitive to ethical computer use. However, the general mean of the surveys is above the average by a small degree that makes the participants' judgments of ethical use inconsiderable. it can be concluded that they undermine ethical computer use. Science teachers and computer education teachers' judgments were less ethical than those of classroom teachers and social sciences teachers. The results also revealed that female candidate teachers were more concerned about ethical issues and that prospective teachers who had up to five years of PC experience considered ethical computer use more than those with five years and beyond. After the survey analysis, the study was completed with qualitative data gathered from semi-structured interviews with nine students. (C) 2009 Elsevier Ltd. All rights reserved.