fan will not manually spin when set to lower gpu temp. monitor goes into sleep mode after 105 degrees C gpu temp

So does the gpu fan not spin at all? Anyways, leave it's settings at default values, clean all dust on it, ensure the fan spins correctly from the moment you turn the pc on, if it still overheats (going beyond 70ºC) and the fan works appropriately try reapplying thermal paste (look for video guides on how to do it on your specific video card).

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