Why can't I adjust my brightness?
I just finished replacing my battery and wifi card. Some time ago, I had replaced the screen assembly. Since then, the computer had been sitting unused in a drawer.
My brightness will not adjust. It is also somewhat dim. The buttons work, but when I adjust the brightness it stays exactly the same from one bar all the way to the max, although the screen will turn off if I take it down to zero bars.
I have reinstalled a fresh copy of the OS, and updated the software. I have reset the PRAM. I have reset the SMC. I have disconnected, then reconnected and reseated the screen connectors. Still, the problem will not go away.
After resetting the PRAM, the screen was momentarily at what appeared to be max brightness, but then dimmed itself again.
Any ideas? The computer is usable except in bright light, but I do want to have it perfect, especially after all the repairs I’ve done to it.