Question: Backlight turns on and off randomly
I have an extremely annoying issue with my original 13" MacBook. Basically, at random times the backlight shuts offs as if the computer is going to sleep. Sometimes, it can be fixed (temporary) by shutting the lid and opening it again, as if the computer is waking up from sleep. There seems to be no obvious way to reproduce this problem – sometimes I go for an hour or more without it, sometimes it happens ever 10 seconds and the computer is unusable.
So far, I've tried resetting the PRAM and the SMC – no effect.
Any ideas to fix this would be greatly appreciated.
Macbook (late 2006), Mac OS X (10.6.4)