The full speed when the machine does not boot is NORMAL. It's a shame the maker didn't explain that.
The other times, it sounds like it's booted and changed to on demand cooling. Didn't the maker document this?
hello i just built a Desktop and the Cpu fan will not function when the ram is installed and the computer functions. if i put the ram into the 1 or 2 spot nothing happens on the screen but the cpu fan runs at full rpm, but if i have the ram in 3 and/or 4 the computer boots, but the cpu fan does not run it just gives a slow turn then stops for a few seconds and repeats. i have a sabertooth z77 mother board, ivybridge i5, and kingston hyper x ram in two four gig sticks