The cooling fan of my GPU (GeForce GTX 660) sometimes won't work. Even if the GPU is overheating and EXPERTool says the fan duty is at xx %, in reality it's at a complete stop. If I leave the pc running for long enough the fan will switch on and off randomly. I doubt it is a power saving feature of it, as it won't turn on even if the GPU temperature is reaching very high temperatures, even it's safety-shutdown temperature limit (around 100 C).
Any ideas I can try before I take it to a service?
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