Quote:
| Originally Posted by pieater I would agree, except that the display starts at full brightness on startup and then visibly darkens down. Sounds unlikely to be a hardware issue therefore? |
Well it could be a hardware issue.
First thing I would do is completely disable the Energy Saver.
Click the Apple in the main menu, select "System Preferences". Click the light bulb icon, drag both sliders as far as the they will go to the right (never), then Click "Options" and un-tick "Automatically reduce the brightness of the display before display sleep."
If it is a lap top you need to make the settings twice, once for each power profile (mains and battery).
There is a known issue with some Macs not retaining the energy saver setting between full reboots. If you are affected you will need to tick and then untick the "Automatically reduce brightness..." option after each boot. If you normally leave your Mac sleeping but have recently rebooted, it would explain why it has started behaving oddly.
HTH