A few weeks ago when I would boot up, my monitor would hum. The humming stopped, but around that time I notice that some of the text looked odd, like it was very low definition. Some lines of text would look OK and the next looked weird. Sometimes it was fine other times not. I assumed it was the monitor, so when I saw a nice BenQ on the 'egg, I bought it. The monitor looks great, but the text issue persists. Now I'm wondering if it's my video card (ATI Radeon HD 4870). The device manager says it's working properly. Any ideas? I already spent money on a monitor I didn't need and I don't want to start replacing things willy-nilly. Thanks.