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

I had the same thing happen when I attached a USB cable. I removed the back cover and simply unplugged the battery connector from the mother board and then plugged it back in. I replaced the back cover and it booted up just fine. I hope that helps

Who ever you are, I kiss the ground you walk on!!!!!!!!!!!!!!!!!
I'm in the process of writing up my phd dissertation thesis ....
You guys .. you are strangers, and at 2.40am sydney time I love you each more than my parents!
And will pay to forward to every random stranger I meet!!!!!!

i literally just unplugged and replugged the plug/cap connecting the battery and the motherboard.

I am having this same problem right now.  (Started last night)

Stupid question but how exactly do I leave my laptop on? (technically it's off?) Do I just open it and leave it sitting there for a few days? :S

I'm having the exact same problem right now! How do I know if the battery is draining? Do I need to leave the computer open for this to happen?

Reset your SMC.

Resetting the SMC of an Intel-based portable Mac with a removable battery

Note: This will not delete any data.

The SMC is responsible for controlling various system functions. None of your data will be deleted by resetting the SMC.

Shut down the computer by going to Apple () > Shut Down…

Select Shut Down or allow the computer to shut down automatically.

Plug in the MagSafe power adapter into a power source and then connect it to your Mac if you have not already done so.

Remove the battery.

Press and hold the Power Button for 5 seconds.

Release the Power Button.

Reconnect the battery and the MagSafe power adapter.

Press the Power Button to turn on the computer.

Austin

I've tried this already. And I can't turn my computer off because it isn't responding at all. The battery lights on the side of the computer don't even work. There is a faint green light on the charger when it's plugged in, but it is barely visible.

Put your finger on the power ton and hold it down until the Mac turns off, this will take 5 to 10 seconds.

It appears to already be off. There is no display on the screen and the fans aren't on. I've tried to do the SMC a few times and nothing is happening.

If it's already off why are you asking how to turn it off?

I'm not. With respect to the rest of this thread, they mention that the battery needs to completely die. I was simply wondering how I know if the battery is dying/dead if the computer appears to be completely off.

I love this post! Totally solved the exact same issue happened.

Mine 2012 Mac book pro was no where near 100 % when I plugged in a cheap USB charger and the mac shut down. I was freaked out but I found this thread. I left it for four days, and finally it started to charge! I almost opened the back cover to disconnect battery cable.. Thank you all!!!

I Was plying minecraft and was downloading a mod and suddenly my MacBook Pro turned off. Anyone help plz

Another happy ending here!!! It happened to me the same as described above when I connected a win-formatted HD (wanted to see whether it was working or not... it obviously had problems). Immediate blackout, no response, faint tinkering green light when connecting charger. Since my battery was about 30%, I tried turning on again every 12h (left it with the screen open just in case, don't know whether it makes any difference). It didn't work for the first two times and I was loosing hope. In my third try, after about 36h of wait, it magically turned on again as if nothing! Did the SMC resetting as well as adviced above... thank you so much guys!!!

One question: is the battery running normally now, or has it been damaged by the event?

I have experienced the same problem...but was luckily able to fix it with advice from all of you!

My Story:

My MacBook is extremely new...I have had it for a little over a month. I just graduated high school, and since a MacBook was a requirement for my department at college, my grandparents bought it for me as my graduation present (which was extremely nice of them)! You can imagine how nerve-wracked and anxious I was when I plugged in my iPod (using a cheap, third-party cable) and the thing completely shuts down. When I tried turning it back on and it did not, I can not even begin to describe how upset I was, knowing that I might have just killed my computer, lost all my data (that was saved from a previous computer), and on top of that, would have to buy a completely new one, telling my grandparents that I just threw their $1000 down the toilet.

Upon finding this thread from my iPod, I couldn't believe my luck. I saw all the advice on the first page (but for whatever reason, did not check the following pages) and just let my computer sit. I saw someone recommend letting it sit for around 30 hours. I left it sit for 40, just in case, and when I attempted to turn it on: no go. As my worry increased and the pit in my stomach I had been carrying around for 2-3 days dropped a little further, I once again found my way to this thread. It was then that I noticed the second and third pages to this forum. I saw many people advising to take the battery out, which I was scared to do because I did not want to void my warranty with Apple.

The Fix:

Then I stumbled onto the posts that recommended I simply disconnect the battery from the motherboard, ensuring that it would not void my warranty. I only unplugged it for about 30 seconds, convincing myself that if it didn't turn on, then it would be because I had not left it unplugged for a long enough period of time, and I could have another try at it; basically preparing myself for another failed tip. BUT LO AND BEHOLD, IT WORKED! My computer booted up, no data was lost, and I was even able to reopen the tabs I had up on Google Chrome at the time the computer shut down. I am typing this post (on my newly fixed MacBook ) in the hopes that someone will read it and be reassured that disconnecting the battery from the motherboard will reboot your laptop, provided your circumstances are basically the same.

Thanks to anyone and everyone who commented on this thread, because your advice, trials & errors, and comments made it possible for me to fix my laptop. Thanks again and God Bless.

I posted my answer for this here.

Re: My Mac randomly just turned off and now it wont turn back on, the charger light is faintly flashing green and amber?!?!