Dark area on bottom left side of screen

This problem has been occuring for several weeks now. The problem occurs on and off.
I have notice a very large darkened spot on my LCD extending from the bottom left corner diagonally to the middle of the display. I can still see "through" the spot to whatever it is sitting on top of.
Again, sometimes the spot is there and other times it is not. I have had this PowerBook for a year and two months. What is going on?
Thanks!

Welcome to Apple Discussions, Chase.
From your description it sounds like the screen on your PowerBook is suffering from uneven illumination. Unfortunately this kind of problem only seems to get worse. Usually the problem will be visible at any brightness setting except maximum, especially on light (or white) backgrounds. Ultimately it can reach a point where the problem is permanently visible.
An LCD screen can often display some kind of uneven illumination, which is considered normal, when it has not yet warmed up. The warming up period usually takes a few minutes (my PBs take about 5 minutes). If the uneven illumination continues beyond this period then the screen is most likely defective.
Normally the fix is to replace the screen and inverter board, covered under warranty if it can be replicated by the Apple engineers. I have found that the best way of demonstrating the problem to service personnel is to switch the desktop background to white and the screen to half brightness. A white background can be set in 'Desktop & Screen Saver' within System Preferences by choosing the "Solid White", which is the last option just to the right of the last visible option ("Solid Mint").
However, unless you have the AppleCare Protection Plan or some other form of insurance, it will be an expensive repair as your PB's standard one year warranty has expired.
15" 1.25GHz/12" 1GHz PBs, 2xPPC Mac minis, 12" iBook G4,   Mac OS X (10.4.6)   Cube, 2xTAMs, iPods 2G/4G, iPs, AEBS, AX

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