Hi all, I recently installed a new 12v 80mm square case fan. I now find that the case fan appears to spring up and down in speed.. Making a noise which one of my coleues refeed to as hunting. I do not think the fan has a termp sensor as one is fitted to the cpu fan. Cound this be caused by a psu probem. It appears to happen when the PC gets warm. Pc brand 965 Viglen slimline model. rhanks Robert Fernando Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://freepctech.com