Classified says:. November 10, at am. March 9, at am. Use a Mac at Night?
February 25, at pm. John A says:. October 13, at am. Anthony J says:. July 2, at pm. Patricio says:.
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July 1, at pm. Leave a Reply Click here to cancel reply. I can't quite picture a newer apple keyboard that's large enough to have F1-F I thought you could assign whatever to F keys?
I just found this works on my iMac G4 by accident and came here to see if this has been reported on. Strangely enough I have had my iMac since they first came out and just noticed that it had F13, F14, and F15 above the help, home, and page up keys.
Use the brightness function keys
I pressed to see what they would do and found the Screen brightness settings. Pretty cool, but mostly useless on the iMac.. I leave it all the way up all the time. Lost your password?
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Powered by the Parse. To change the brightness of your screen, hit F14 or F This may not work on all hardware, it does work on a cube w. Don, sounds like either a bad inverter or a bad backlight. What are the last three of your serial number?
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This will identify your computer a bit better and might help to further trouble shoot. The complete serial number is WX31AQ. In an effort to try to diagnose the problem myself I took the display off my daughter's old A that had died some time ago and put it on this one and the problem is still there. My daughter's laptop was working perfect until it stopped turning on so if the problem I'm experiencing is in the display I think that it should have fixed the problem, but it didn't.
Nothing that I have done seems to make the light adjustment better or worse. When I hold F2 down the light image is displayed on the screen and the bar below it indicates that the light is being increased but the display light doesn't change at all.
How to Make the Screen Brighter on a Mac Computer | It Still Works
When I hold down F1 the bar indicates that the light is being decreased but it doesn't change a thing on the display screen either of the screens that I have tried out. Don, first I must admit that I am not a Mac person.
So this answer is a general answer and hopefully the Mac Guru's can help you out further. Since you already replaced the LCD with a working one, it is possible that this is caused by a bad inverter. Try to connect an external display and see if that works. If it does not, then you are having GPU trouble on your computer.
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Apple suggest:" No display or dim display, but computer appears to operate correctly and has video operating on external display display is fine after startup, but after a few seconds no display or dim display. Reboot the computer—hold down the Control and Command keys and press the Power button, or press and hold the Power button for 5 to 10 seconds to shut down the computer, then press the Power button to restart.
Reset the SMC. Reset PRAM. Restart the computer, then hold down the Option-Command-P-R keys until you hear the startup sound at least one additional time after the initial startup sound. Verify battery connector with sleep switch connection. Check cables around the hinges for damage.
If the numbers are right, then you have a fuse for your backlight on your logic board. Test it with a multimeter and see if you have continuity. If not then you need to replace that. Hope this helps, good luck. Well, I guess that it really doesn't matter at this point since my computer finally quit all together. I now assume that the problem all along has been a weak logic board that finally just decided that it had, had enough and gave up and quit.