Has anyone else noticed a buzzing noize from this or any other LCD? I've had mine for a few weeks now and I hadn't noticed this until recently. It's quiet enough that I can only hear it when there's not a lot of background noise and there isn't much sound from whatever I'm watching. Now being aware of it, it's driving me nuts. I can only assume it's the backlight or a fan. I'd like to know if this is normal or if I've potentially got a dodgy set.