[help]Macbook pro 15 a1286 won't power on

**keeney123** · 03-13-2016, 12:55 AM

Re: [help]Macbook pro 15 a1286 won't power on

Make sure the Ram is seated correctly. Both sides should be plugged in and they should of heard a click when the metal locks clicked into the side of the RAM board. Also make sure the HD is seated properly. If you have done this then the next thing is use an external monitor and see if the internal screen is bad. You will have to try and switch form the internal screen to the external screen if this is not detected automatically. Then after that you can go to this thread to see what is involved in trying to trouble shoot a power problem on the board. https://www.badcaps.net/forum/showthread.php?t=52450

**phantomEVO** · 03-13-2016, 01:25 AM

Re: [help]Macbook pro 15 a1286 won't power on

ac is totally dead so it is not a screen problem

**keeney123** · 03-13-2016, 01:53 AM

Re: [help]Macbook pro 15 a1286 won't power on

Are you meaning the DC plugin adapter? What AC? Do you have a schematic for it? I reread your first post. You said you were able to get into the disk utilities. Did you try putting back the old ram and HD? It sounds like a software problem. Did you try to do a recovery. I forget which button that is. Should be in the manual. I do not know if Apple has ever done locking up one hard drive to one machine. I know PC manufacturers have done this.This is done on the motherboard. I guess I would return it to the state that you got it from your friend and try to do a recovery.

**keeney123** · 03-13-2016, 02:31 AM

Re: [help]Macbook pro 15 a1286 won't power on

The other thing is you may have a bad thermal sensor which is shutting it down or the program that reads the thermal sensor is corrupt and then that is shutting it down. If the fans are at full blast. I would think that is because they are being told to do that. Either the software is corrupt and causing this or the sensor is bad. The only other possibility might be a open circuit in the thermal sensor line. Perhaps an open would be read as a hot temperature? I would observe a good Apple computer and see what the fan does on start up.

**phantomEVO** · 03-13-2016, 02:46 AM

Re: [help]Macbook pro 15 a1286 won't power on

Sorry my english is very bad!

i meant MAC and not ac!

the mac is totally dead: no power at all, no fan spin, no sound. no led for the battery status and green led from magsafe. it is not a memory problem because the problem is also with old ram. the strange thing is that sometimes it boot.

there is only one way to power on it every time

disconnect the battery, hold power button, connect the power supply, keep holding power button, then release the power button and then push again power button.

in this way the mac power up but after some minutes it power off

**dellxps15** · 03-13-2016, 05:23 AM

Re: [help]Macbook pro 15 a1286 won't power on

15 inch macbook require 85 watt psu.

**keeney123** · 03-13-2016, 10:45 PM

Re: [help]Macbook pro 15 a1286 won't power on

Originally posted by phantomEVO

Sorry my english is very bad!

i meant MAC and not ac!

the mac is totally dead: no power at all, no fan spin, no sound. no led for the battery status and green led from magsafe. it is not a memory problem because the problem is also with old ram. the strange thing is that sometimes it boot.

there is only one way to power on it every time

disconnect the battery, hold power button, connect the power supply, keep holding power button, then release the power button and then push again power button.

in this way the mac power up but after some minutes it power off

You said you were able to get to the disk utilities screen correct? If yes, have you tried to do a system restore? You hold down the command key and R key on boot up. Better yet try booting into safe mode. You can find these options at this link.
http://www.howtogeek.com/189104/trou...artup-options/

**phantomEVO** · 03-14-2016, 02:27 AM

Re: [help]Macbook pro 15 a1286 won't power on

Originally posted by dellxps15

15 inch macbook require 85 watt psu.

so could it be a psu problem?

**phantomEVO** · 03-15-2016, 05:52 AM

Re: [help]Macbook pro 15 a1286 won't power on

so with the 85w adapter it boots without problem but power off itself during loading machos. if i stay in the screen where i have to choose from which disk i have to boot, i does not power off.

last thing. when i insert the power supply, it power on itself

**phantomEVO** · 03-20-2016, 11:42 AM

Re: [help]Macbook pro 15 a1286 won't power on

i think i've found the problem: disconnecting the keyboard flex, i can boot without problem the macbook...so maybe i should change all the keyboard? :S

**dellxps15** · 03-20-2016, 02:16 PM

Re: [help]Macbook pro 15 a1286 won't power on

yes those macbook keyboard fails very often. try another keyboard if works fine.

**phantomEVO** · 03-21-2016, 01:56 PM

Re: [help]Macbook pro 15 a1286 won't power on

so i can't fix only the button?

**keeney123** · 03-21-2016, 03:45 PM

Re: [help]Macbook pro 15 a1286 won't power on

Most likely by the time you get the parts to try and fix a keyboard that already has failed you could buy the whole keyboard new. They are pretty cheap.

**phantomEVO** · 03-22-2016, 01:55 AM

Re: [help]Macbook pro 15 a1286 won't power on

what i don't understand is: why if go to the disc selection screen (with alt key) it doesn't power off. i'm scared that the problem is not the keyboard.

but i know that if i disconnect the keyboard i can boot fine the macbook

**phantomEVO** · 03-22-2016, 02:36 AM

Re: [help]Macbook pro 15 a1286 won't power on

another strange thing. (with keyboard disconnected): as soon as i put the power supply, the macbook boot up

**dellxps15** · 03-22-2016, 03:54 AM

Re: [help]Macbook pro 15 a1286 won't power on

Originally posted by phantomEVO

what i don't understand is: why if go to the disc selection screen (with alt key) it doesn't power off. i'm scared that the problem is not the keyboard.

but i know that if i disconnect the keyboard i can boot fine the macbook

try an usb keyboard if works fine.

if u disconnect keyboard, u power it by smc bypass or macbook power on itself ?

without keyboard, macbook works fine? are u able to log into osx desktop ?

Originally posted by phantomEVO

another strange thing. (with keyboard disconnected): as soon as i put the power supply, the macbook boot up

that is normal. after u put battery back in it do a pram reset and all wil lbe ok.

**phantomEVO** · 03-22-2016, 07:34 AM

Re: [help]Macbook pro 15 a1286 won't power on

ok i've installed a new keyboard and now it doesn't power off anymore. the problem is that i'm not able to boot from usb to format the new ssd and install el capitan. the loading is super super slow and i don't understand why. i've formatted two type of usb with different version of el capitan but it's impossible to boot from the usb.

now i'm connecting via usb the old hard drive with the old operating system, but it seem also super slow

**phantomEVO** · 03-22-2016, 07:55 AM

Re: [help]Macbook pro 15 a1286 won't power on

ok with the old hard disk, it boots superslow, but it boots. strange thing is that the date is wrong.

but however it seems to work without problem...

other strange thing: when i power on, i've not chime, even if it boot to the system....

**phantomEVO** · 03-22-2016, 08:55 AM

Re: [help]Macbook pro 15 a1286 won't power on

please suggest me something to do!! i'm going crazy!!!

like 1 hours to format the ssd, then reboot and i'm stuck at 5% of loading bar!!! why?!?!?!?!?!

in the while i've done the pram reset and now i've the boing

[help]Macbook pro 15 a1286 won't power on

[help]Macbook pro 15 a1286 won't power on

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