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Hi, recently, for no apparent reason, my MacBook refuses to turn on when the power button is pressed. I hear the hard drive and dvd drive kick in as well as the apple ding, but no monitor backlight or image. I have tried with and without the battery plugged in and have tried letting it charge. The keyboard backlight will come on eventually, but doesn’t stay on. Any help will be appreciated. Thanks!
Resetting the Power Manager If the computer is on, turn it off. Restart the computer by holding down the reset button to the left of the Serial port for 10 to 20 seconds. If the computer does not restart, repeat step 2 three or four times. Resetting the Power Manager and PRAM Resetting the parameter RAM (PRAM) when the computer is shut down also resets the Power Manager. The following process resets both the Power Manager and the parameter RAM. If the computer is on, turn it off. Make sure the Caps Lock key is not down. Restart the computer. Immediately after hearing the startup sound, simultaneously press and hold Command-Option-P-R. (If you do not hold down the key combination within 5 to 10 seconds after the computer restarts, you must repeat steps 1-3.) Hold down the keys until you hear the startup sound again. Then release the keys. If the computer shuts itself off, press the reset button on the back of the computer to turn it back on. When the computer has finished starting up, restore any custom settings. If this doesn’t work then insert your system disk and start up holding down the “C” key. On the third screen a pull down menu will appear. Go to Utilities - Disk Utility and see if you can repair your disk. If this fails then reinstall the system. Or do the following: Get to another mac and start up in target mode. Connect via firewire cable, start the bad machine holding down the “T” key. It should bring the hard drive up on the other machine. Get your data off first. Then run disk utilities. Also check remedies listed on Apple’s site for gray screen: http://support.apple.com/kb/TS2570
I had same problem no chime blank screen did have power light apple logo keyboard lights. Did SMC reset and it worked but weeks later same wont start up blank screen etc and now no apple logo light or keyboard lights and SMC reset not working. I have researched and there is a fault with this model a1226 relating to video and graphics chip sets being cooked As they are poorly designed for ventilation this had a fix from apple back in 2011 free until 2012 cant find any more info.
Dear Sir/Madam, I accepted MacPro 2013 (A1502) with UEFI lock and with folder question( No OS) from my friend. I waited to buy MattCard to unlock it and restore OS, that’s why I accepted it from my friend. I kept MacPro in my Room. After 3 weeks later, I power on it in this morning, but nothing coming up, but still light in charging port. (still not order MattCard yet.) No light in Apple Logo, No Screen, No sound in Mac’s Screen and Keyboard. Please help me how to fix. Best Regards, Nai. 23 Feb 2017
I will be videoing live repair of a laptop with this same issue in 3 weeks. Stay tuned for more details.
Ok, sounds like you have a display issue off hand. Try connecting an external display and see if it gets a picture. Also you can shine a flashlight on the screen, if you get a faint picture it’s the backlight. You also want to try resetting the smc. To do that you remove all peripherals, the battery and the power adapter. Then hold the power button down for a min of 5 seconds. If the smc reset works you should be good if not there is a good chance you need to repair the computer. Xen
