I have an eyelash-sized dark streak on the center, bottom (dock area) of my Powerbook G4 15". At first, I thought it was dirt, or another external blemish, but if I move the cursor over it, it obstructs the view of the blemish (instead of appearing beneath it.) Also, I have a small, almost white, faded dot which appears to grow and expand larger if the Powerbook is running for longer than 4-6 hours. What is frustrating is that neither show up under screen captures. Is my monitor full of external stains and blemishes which I cannot remove, or is there something actually wrong with my display?