Clean the internals with a soft brush. Make sure the power is unplugged first and only use the brush to loosen the dust build up in the case. You can remove the fan and clean it properly out of the case, this will give the fan better efficiency, so it won't have to spin so hard to give the same cooling.
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Clean the internals with a soft brush. Make sure the power is unplugged first and only use the brush to loosen the dust build up in the case. You can remove the fan and clean it properly out of the case, this will give the fan better efficiency, so it won't have to spin so hard to give the same cooling.