I just got a brand new 24" asus monitor, and this problem just started happening. It will be at regular brightness for 1 second, and then it will go dim for 1 second, and it continues to cycle dim/bright. I just got it, so it shouldn't be a problem getting it replaced, but does anyone know why this might be happening?
If it is an LED LCD monitor, look for a setting called "dynamic contrast". If it has this feature, you can turn it off and the monitor should stay at a consistant level of brightness. Provided that it's working correctly. Also, do as MJ5150 said and try loading the driver to see if that helps.
Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products. Browser not compatible