https

/www.google.com.pk/search?q=one+of+system+fans+is+not+working+press+enter+to+continue&espv=2&biw=1517&bih=756&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiyzsj-mKbJAhUGkI4KHT3gDacQ_AUICCgD&dpr=0.9#tbm=isch&q=system+fan+90b&imgrc=KQVRbEpVxbj2hM%3A It looks something like this. What is the exact error.