Q: 2011 MacBook Pro won't turn on... At all.

Wooohoooo!!  I did everything - waited 30 hours, waited 12 more hours, tried to do the reset - nothing nothing nothing.   Then, I took the back off and watched a video how to disconnect the battery (fyi, you don't even need to unscrew the battery - all you need to do is disconnect the thing-y from the motherboard - or something like that - and wait 15 seconds or so for good luck, and reconnect).... and... guess what????   I'm back in action.  woohoo!!!!

Btw, my battery is at 51% even after the 48 hours or so - computer wasn't on, so wasn't draining.  To be honest, I don't think you need to wait all that time, just shut it down and disconnect/reconnect and it should work.

It was definitely a short due to the 3rd party cable - which I have since thrown away!! 

Thanks for all the detailed comments and help!!

This thread has saved my life!

I have the same case like others in this thread. My mac pro was dead when the battery is 86%. I found this thread and literally wait day by day. My macbook is a late 2011 with unibody version which i can't remove the battery. On my forth day the mac giving a sign of living when i plug in the macsafe and the bright green indicator turn to orange after a while( it just give a faint green colour before). and now the macbook is struggling to be normal as i can heard the sound of fan and battery is charging normally. all document is still safe. My advice.. Just wait very patiently!! And dont use usb cable other than apple product. Good luck 

This thread saved yet another mac pro ....

in my case removing the battery and plugging it in again didnt do the trick.    neither did using a replacement battery work... had to leave the mac with the same battery to drain completely no led battery charge indicator turned on... left my mac for a couple of weeks.

Plugged it back... and it just fired up as usual...

Thanks a bunch folks...

Hey my macbook pro is in the same death situation as yours was, when you say you unplugged the battery did you unscrew the bottom part of it off? As my mbp is one of the new models where its all built in and not easy to take out....??

I had the same problem a week ago, my MBP early 2011 suddenly died , of course i had a mini heart attack as i didn't know what was happening. I have searched the internet for the problem , tried reseting the SMC , PRAM etc. and nothing. I took the back case off unplugged the battery and there you go my macbook was working only on power chord. I've replugged the battery and nothing, same problem , faintly light on the power chord and no response for my macbook. Freaked out again, it came to my mind to unplug the battery again and try reseting the smc with the power chord plugged(to mention that my macbook was woking perfectly without the battery plugged) and after reseting SMC and PRAM got it working again as usual with the battery plugged.

DID IT AGAIN : today my macbook did the same trick on me, and after another mini heart attack and a research on the internet found this thread and saw the post about USB going wrong.I realised then that i was using a wireless USB cheap mouse and that could be the problem. So, now i will try using without it and see if it does it again. To mention that my battery health is normal . Greets and thanks lot to everyone posting to this thread.

I have the same issue and this didn't just happen once...but twice since I updated to Yosemite or what ever its called. Its frustrating and the worst is that you can't even get help right away. You have to go true paying phone call or hope you get an appointment in a few days. For the price of Apple items the calls should be a standard service. Im so annoyed.

I have this same problem. My computer has been, for lack of a better phrase, unused since december. At the time it was working fine. Now when I try to turn it on, it doesnt turn on. When I connect the magsafe adapter, the light on the adapter is green, and when i press the battery level button, the small lights blink green. When I hit the button without the adapter, nothing happens.

well, thank you all for your information and input. I thought my Mac was toasted  and I'm so glad I found this thread. I remeved the cover and unplugged the batt as well...awesome...backflips!!!!!

your solution save my mbp... Thanks

There is a recall on the 15 inch 2011 powerbook (may also be on other sizes) they replaced my logic board and  had it the next dat

i have had the same issue, actually mine's in the mid 2012, i have waited for like 33 hours for my mac to drain the battery, but it does't seem to work out, that after 33 hours that charger just went faintly green and also red, again, can somebody pls help me

Hi I attached my iphone 4s for charging while my macbook pro 13" mid 2012 is running, After i forget to charge mac book pro and it shut down due to battery low. After i connect my charger but it shows dim green light which difficult to see and mac book also not turning on. What steps i have to perform?

Please Help me.!!
My story is I am watching movie and my iphone 4s is connected with MacBook Pro 13" Mid 2012. My mac is not in charging so it was turn off due to low battery and then i connect magsafe charger with my Macbook it show light dim green light and when I press power button MacBook Pro is not starting up.I updated my OS with Yosemite. Please tell me some steps to work it again.

Tips of unplugging battery from logic board works!  Easy breezy, my MBP battery was fully charged when this happened because of defective ipad cable and I was not willing to wait for months till battery is going to be drained completely.

unscrew back, locate connector, unplug, wait 60 sec or so, plug it back, and whola, it is back in business.

whole process took probably less than 5 min, spend more time recording which screw goes where and cleaning inside bit with air duster

Great tips