Blank Pale Screen, computer works fine when connected to external vid

My powerbook has been working fine, though I've been living in a very hot place so it has been subjected to extreme heat at times. One day, put it to sleep before a meeting, when I opened it to wake it up, it showed only a blank greyish/white/pale blueish screen. I rebooted, same thing. The computer makes the startup chime, the caps lock, volume and even brightness keys all work, there is just no image. When it should be showing the apple startup logo, the screen is slightly paler with really faint white lines running along center right. When it should be showing the desktop, it is blank with a small circle of slightly brighter light in the upper right hand. Connected it to an external monitor and was able to get my data off and work on it just fine. A week later, still no change to display. What's wrong? What can I do? (This computer is obviously outside of warranty and apple care as it was purchased in 2005)

Your video cable or your LCD panel has failed. If there is no change in what appears on the screen when you change its tilt angle, the LCD is probably at fault. If changing the screen's angle causes any change in the displayed image, the fault is probably in the cable. Apple's response to either fault would be to replace the entire display assembly, which includes the cable. That would cost a great deal — probably more than the machine is worth in good working condition. You could buy a good used display and install it yourself for less, if you're up for a DIY challenge:
http://www.ifixit.com/Guide/Browse/PowerBook
If you're not, you may want to start looking for another machine.

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Blank Pale Screen, computer works fine when connected to external vid

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