Macbook Pro suddenly shuts off. screen goes black and won't turn off till after a few hours.

Hi everyone!
So I've had this problem from my macbook since months ago. It sometimes just shuts off by itself, the screen turning black and won't turn on until like after a few hours (sometimes a day, but sometimes you could also immediately open it just like that.)
When it shuts off and you plug the adapter it is still charging, the lights on the side of the macbook book still lights up just fine if you press the button on the side. the only problem is that it wont open until after a few minutes, hours or days (very unpredictable) (also tapping the macbook helps, I dont know if it "really" helps or not, but it works sometimes.) But when it open it will be working fine until another couple of weeks or 3 or a month (again unpredictable)
I dont know what's wrong with my laptop, please help me. It would be greatly appreciated! thank you so much in advance!

Hold the power button down for 10+ seconds. Then bring the MBP to an Apple store for an evaluation.
Ciao.

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It could possibly be the video card, or the logic board. You could try a smc reset if you have not done s yet. smc reset:
http://support.apple.com/kb/HT3964
I had an issue similar to this, and there was a bad logic board, hard drive and video card.
You might want to bring it in to the Apple store, they do the diagnostic for free and give you a repair price.
They offer a flat repair rate, which they fix what ever is wrong as long it was due to liquid damage.
The repair cost me about 1/3rd the price of a new machine and the machine has been fine ever since.
It's worth getting it checked out.
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Hello,
From the news page here...
http://xlr8yourmac.com/
See if it's related to this...
It also seems to be related to later OSX versions, like 10.8.x & 10.9.x
The 2012 macs (and later apparently) (also later OSX versions on earlier Macs can do it also), not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750
Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"
http://xlr8yourmac.com/archives/sep13/091313.html#10.8.5SleepEjectTip
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A few years ago, we purchased iMac 27" 11,3 (Mid-2010) (with i7 2.93Ghz, ATI 5750 1GB VidRam, etc.) for our offices and software development team. They were originally shipped with Snow Leopard and worked as expected and without any problems. However, a year later, we upgraded to Lion and all of machines immediately exhibited the same problem: the screen would go to sleep by itself and would require a hard reboot or sleep on/off. (Only the screen was asleep and the rest of the iMac continued to function; this was confirmed by screen sharing to the machine.)
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This shows how to get inside: http://h10032.www1.hp.com/ctg/Manual/c00225826.pdf
If you have never done something like this before, maybe enlist a friend to help. I suggest you not remove the CPU heat sink if that chore is not a task done before, at least without a knowledgeable friend along.
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Macbook Pro suddenly shuts off. screen goes black and won't turn off till after a few hours.

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