Hello, I was curious to know how durable the PowerBook screen is. I have some grime on it and when I use my fingers to rub the dirt off, there's that bleeding paint that appears because I press on the screen. It seems that no matter how little pressure I apply on the screen, this will happen. Is this okay for the LCD screen? It's discomforting to see that bleeding paint image appear when applying slight pressure. Would appreciate any comments on this matter. Thanks.