I just noticed that my view sonic A90f+ crt monitor (19inch) monitor is flickering around the edges of the screen. Its kinda hard to explain it. I want to say its kinda like a light vibrating look to it. Is this bad? I have the resolution set at 1152 by 864 and I have it set at the highest hertz which is 75. I thought maybe because the resolution is high I set it back down to 1024 by 768, but the same problem keeps happening. Any ideas?