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joshfreeman
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Computer will not turn on stays at black screen

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Hi, recently for no apearant reason my MacBook refuses to turn on when the power button is pressed you hear the hard drive and dvd drive kick in you hear the apple ding boot sound 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 doesnt stay on none of the other keyboard lights work ... caps lock num lock etc ...

any help ??

Thanks

Edited by: oldturkey03 ( ) , machead3 ( )

Any liquid spilled on the MacBook Pro ?

lemerise,

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mayer
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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

not grey screen its black, no backlight even, tried reseting using command option pr no luck my MacBook has no serial ports system disk does not work and do not have another mac for target boot.

joshfreeman,

Target mode uses Firewire not serial. The Apple site for grey screen remedies is recommended by Apple after what I had listed for Black screen. You use known procedures for isolating these problems till something works. Next I would do as Xen recommended.

mayer,

i had black screen and Macbook pro 17 inch would have sound, lit keyboard, and starting repeatedly with disks to re boot, it re fused the disk that came with the computer. I found this forum and as Mayer said,press "C" key at start up......well.ill be..............the screen went on and no problems since . may be the cat got on there and did some thing, but i knoe the "C" key worked and re paired the problem : )) thank you Mayer

laura iancu,

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Xen
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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

Have tried external monitor, nothing, target disk i cannot do because this is my only mac, and i dont have serial ports was a reply to the earlyer comment about a reset button that was next to the serial port... took in to apple today and they were unable to even run diagnostics on it because apparently it hangs right after the boot chime ... without video ... should i just assume faulty logic board ? possibly a faulty BGA chip ? i used to fix xbox360 BGA video chips day and night with a heat gun if this logic board is the culprit is it worth a try ? the mac is out of warranty and apple wont even touch it because the case is completely warped as if someone stepped on it but im a broke student and have to do homework somehow !! luckily i have an iPhone to write to you guys with !!

joshfreeman,

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Gerard
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I'm having the same problem except mine happened after i did command option p r. I got the 3 restart noises and everything but my screen just stayed black

Since this question is a year old, I would try the suggested fixes. Tell us why you zapped the PRAM in a new question.

mayer,

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