Technology use in education is largely influenced by external environmental and personal teacher factors. Adding a Turkish perspective, the purpose of the present study was to explore secondary school teachers' perceptions of computers and influencing demographics characteristics. Cross-sectional survey methodology was employed in three secondary high schools known for their educational and technological eminence. A total of 130 secondary school teachers participated. Teacher perceptions were defined to include computer attitudes, technological affinity, technological aversion, and confidence and comfort. The survey instrument measured these dimensions in four scales. General Linear Model findings illustrated effects of computer experience and training, gender, teaching field and Internet connection availability on perceptions. Ownership of personal computer appeared to be an important predictor of higher level computer experience and training, and consequently, more positive attitudes and higher confidence and comfort. Implications address pre- and in-service teacher development programs. Further research recommendations are made.