When my computer turns on everything seems fine. But after a few minutes when my fan turns on loud (my macbook has always run very hot) my screen backlight goes completely dim. Like it does before going to sleep, so I can still see that the screen is on but it's too dark to read anything. When I close it and the fan turns off and the computer cools down I open it and the screen backlight comes back on like normal... until the fan turns on again.
Is this a problem with my screen or my fan? Or something else entirely?
If you haven't already, check your system preferences, specifically the energy saver, under sleep, is your display set to go to sleep? Other than that, I'd make an appointment with apple to have it checked out. Hope that was helpful. Peace
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I would make sure that the screen is cutting power in clamshell mode. These are prone to overheating and it might be cooking your processor. Get SMC fan controller to boost your fans if you feel it getting warm often.
In order to confirm the problem.. first of all turn off the pc and unplug the power cable from the back of the pc.... get a Philips head screw driver and open the chasis.... plug in the power cable and see where are you getting the noise from .... there are three fans namely one on the processor, the other a cooling fan and the last would be inside the power supply.. if its inside the power supply nothing can be done ... if its the cooling fan noise .... try to clean the vents or the cooling fan with the help of the dry cloth and if its the processor fan then its a serious issue ....
This could be a backlight issue, a board issue or an inverter issue. Look at the screen closely, if there is a faint image it's either a backlight issue or inverter issue. To weed out between the two you can just order on inverter, they're 20 bucks on ebay, if that doesn't work, replace the backlight. Backlight repairs are somewhat difficult. As much as I would like to be able to tell you a quickfix that will solve backlight the problem, you'll most likely have to google for guides that show you exactly how to replace the backlight or bring it in for repairs.I work for Mac Repair NYC and i have to fix this problem a lot.
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your problem is probably on the hard drive. The chime sound is a file and as to be read on the hard drive. Try this: reboot system with cmd+s hold. Then type fsck
-y or fsck
-f (too long to explain, one of those will work) . the computer compute and says: ***** FILE SYSTEM WAS MODIFIED ***** type your fsck -y or -f again until the computer no longer says ***** FILE SYSTEM WAS MODIFIED ***** after that, you type reboot, or shut down and power again. If this does'nt work, change the hard drive (mac shop - expensive)
Apple doesn't provide voltage information for the Inverter Board. If you are getting external video then check to see if there is a dim (un-backlit) image on the display to ensure it is a backlight problem. If so then the chances are good you have a failed inverter board.
when the computer boots does the screen light up? if it does the first thing you need to try is when you turn the computer on is to option boot. That is done by holding the option key while turning the computer on. after it boots you will see the the hard drive listed on the screen it will be a icon, if there you should be able to boot up. If the computer does not boot and your hard drive is still listed you most likely have a logic board aka mother board issue.
Disconnect any devices connected to the computer including printers, hubs, and third-party keyboards or mice, and test the computer again by trying to turn it on.
Press the control key, the command key, and the power button simultaneously and hold for three seconds to try to restart the computer.
If that does not work :
Reset the PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models. If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe