It's been some time now that my GPU fan gets stuck somehow and doesn't spin when turning on. If I turn the computer off and spin it myself manually just a little then it'll go just normal. It's like there's some kind of friction that it can't win by itself.
I already cleaned the dust out of the fan and heatsink. It still gets stuck. My guess is something somehow managed to get in that junction of the helix and the fan's base. Is it safe to remove the helix to take a look? Is it even possible to? I really don't know and the whole thing looks really frail so I haven't tried.
It's kind of hard to give you a straight answer without looking at the fan myself. If you notice an abnormal friction than it may be possible something is stuck inside the fan mechanism. I can't be sure from this side of the screen... sry.