Mac screen brightness
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M$4 Answers
The PRAM stores the display and video settings such as refresh rate, screen resolution, number of colors amongst other things
http://support.apple.com/kb/HT1242
Resetting PRAM and NVRAM
http://support.apple.com/kb/HT1379?viewlocale=en_US
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
For Powerbook and iBook, the instruction is available here
http://support.apple.com/kb/HT1431?viewlocale=en_US
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
I have a Macbook Pro, and I recently had an issue with the keyboard. A number of the keys weren't working (I don't know if any of your other keys aren't responding). I took the laptop into the Apple Store, and they said it was a hardware issue that required replacement of the keyboard. Luckily, mine was under warranty, so it didn't cost anything.
I would suggest finding an external keyboard and hooking that up to the machine. See if, when you hit the F3 key (or whatever key controls screen brightness), the brightness changes. If not, I would suggest taking it into the Apple Store and asking one of the guys at the genius bar.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
Thanks for your help, cp24. It did not solve my issue, though. :-(
If the above troubleshooting steps doesn't work, it's time to take the laptop/desktop to the Apple store for further investigation.