I have a late 2007 MBP (A1226 IIRC) running 10.5. The screen's top 1/3 displays correctly, but the bottom 2/3 do not. About two weeks ago, if I slightly bent the screen, applying a bit of force, the display would alter and sometimes become 100% correct. Distortions were common. Now, the top 1/3 is fine and bottom 2/3 is solid black (well, the backlight works for bottom 2/3, but just a nearly-black display).
Thinking it was a bad LVDS cable, I replaced the cable with a new one. The problem persists.
The display is 100% perfect with an external LCD through the DVI port.
What could be the problem? It seems like a cable issue, but I replaced the cable to no avail.
Also, how can I diagnose this? I would try the Apple Hardware Test, but when I put the 10.5 disc into the laptop and reboot, holding down "d" to boot from disc, I can hear the disc spinning up and such, but no matter how long I hold down the "d" key, the second I release the "d" key (even after 2 minutes), 10.5 boots as normal instead of booting from the disc. That being said, the disc is being read perfectly fine.
Oh, one more thing: I use the built-in camera about once every couple weeks, so I can't be sure, but it seems the iSight camera failed the same time the screen did (at the very worst, merely within a week or two of the screen doing the same). It no longer works. When I fire up Photo Booth, the program displays no received signal from the camera.
I had my logic board replaced for free by Apple about 7 or so months ago due to the infamous NVidia issue, and when I went to the Apple Store yesterday, they told me this problem is not the same thing.
That's all I know; I'd be interested in hearing thoughts.