Previously, the fan would be completely silent unless i ran an intensive application (e.g. a game). Now, whenever i start up windows, the fan kicks into high gear within a few minutes even if i am not running anything intensive. It's loud enough to create a persistent noise.
I took off the back panel so that i could clean some dust out of the grills that might have been blocking the fan intake, but i don't see any difference afterwards, the fan is still noisy after a startup.