PowerPC :: Powerbook G4 Large Dark Spot On Screen / How To Fix It

Let me first apologize for this being very similar to one other topic in this section. However this is exactly what is happening to my computer and no one has answered the other guys thread ( similar to my post - agentphish - posted 01-19-2007, 08:19 AM).

I have searched through 50 of 77pages in this particular forum and my eyes are bugging out. Could someone please give me advice on this matter.

First, about 1 month or so ago I started noticing that in the bottom left and right corners of my screen, about the size of a nickel, it is a lighter color than that of the rest of the screen. It is hard to notice, but I do.

Now, I have recently begun to experience a large round dark area, just slightly smaller than the diameter of a CD in the lower left hand side of my 2 year old powerbook.
It only manifests itself when the computer has either been asleep or turned off for a period of time (typically the longest for me is a few hours during the day that it may be off or at most a period of overnight while I am sleeping)

It seems as though after 5-10 minutes it goes away presumably as the pixels are "warming up" or whatever it is that pixels do.