My Macbookpro 2012 won't turn on, stuck on grey screen, logo and loading bar

It is stuck on the grey screen with the logo and the loading bar, which won't pass after 30%. If i turn it on, it shows it up again but as it reaches 33% it shuts off by itself. Please, help me. I've been searching online for resolutions but there seems to be a wide variety of ways. I'm not sure which to preform as I am scared to make a mistake and accidentally make it worse. If anyone had this problem before, is there any way to fix it without re-installing stuff? Or is there a easy an safe way to preform it? Thanks.

I have a 2011 MacBookPro and I was using iPhoto a couple of days ago when I received a software update message. I clicked OK (as the message assured me that I could continue to use my computer while updating took place). After a while I got a meesage that iPhoto needed to be closed for the software updates to be completed, but I continued working with the intention of closing it soon. After about another minute, the screen split into two panes (one third/two thirds split) and then froze. Hard shutdown didn't resolve the problem and then the screen went black. Re-starting gave me a grey screen and no functionality at all.
Repeated attempts to re-boot made no difference so I followed various peoples' suggestions on-line (using another computer). Even the Safe Mode boot (Power button plus Shift) wouldn't work, so I trekked to an Apple store to see a genius, but was told there was a two hour wait. I gave up and came back, and tried Safe Mode starting again. This time it worked (why!?) and I got into the MBP, but with the vertical screen striping and limited functionality. I tried the Safe Mode boot many times, all with the same result, but eventually I also got a message about iPhoto needing the library to be repaired. I did this (took about 30 minutes). Having done this, it still wouldn't start in normal mode, so I gave up for the evening. This morning I thought I would try once more before booking a Genius Bar slot - and all was working OK (although slightly slower than normal)!! What changed overnight I have no idea but the lesson seems to be - keep trying Safe Mode booting until it clears - very scientific!

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Ok here's my dilema ...
I've read posts about this same problem but I can't get this mbp to do any of the suggested fixes!!
Here's where I screwed up....
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ok I got into single user mode... comand and s
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It's hard to offer troubleshooting suggestions other than the basics when the OS system is unknown. Each OS has it's own troubleshooting and/or diagnostics.
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==============
It would help us to know which comp model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
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Hey guys,
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I will help you to solve your problem, don't worry just follow as I say.
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Why does my macbook pro 2012 try to start up with an apple logo and loading bar and then turn off?

I have tried to turn my macbook on and all i am getting when i push the power button is an apple logo and a loading bar which when it loads macbook turns off. I need this to do ubiversity work. Helplo!! It wont even let me atart it in safe mode.

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My imac won't start up past the grey screen, apple and spinning clock

Hi there. First time posting - usually either apple support website or previous threads solve the problem. Alas, not this time.
I have an intel imac - can't tell you much about the details as I can't get any info out of it. I installed snow leopard about a year ago - no issue since then other than occassionally the screen goes black but nothing major.
Yesterday, I backed up to my usual passport backup and then today, it froze. I couldn't turn it off or restart at all so resorted to the power button. Since then, I can turn it on, it goes to the grey screen (no blue screen) and I get the apple logo and the spinning clock/wheel. For hours and hours....
So, I tried one of the apple support pages and worked through - peripherals, safe boot, NVRAM, PRAM, tried to reboot with mac osx disc (the original not snow leopard) - nothing. Absolutely nothing changes - same old grey screen, apple logo and spinning clock/wheel.
HELP - do I try and reboot with the snow leopard disc? I don't know what to do next - I am no techie so half the threads don't even sound like English to me.
Thanks in advance, hope you geniuses out there can help me out.
abcvic

Thanks for the reply.
I had tried to reboot with the original disc but it never worked. The imac just spits out the disc and eventually, I am back at the grey screen, apple logo and wheel spinning. I tried it one more time following your reply. Same outcome.
My instal disc 1 had the instruction re hardware test which I have also tried with no success. I can't remember if it came with a disc 2 though I seem to have a couple - I also have a macbook and that seems to be still alive even if it is slow.
I tried to reboot with Snow Leopard disc - power on, chime then hold down C key. Same old - grey screen, apple logo and wheel spinning. Disc spat out eventually.
Any other suggestions welcomed or I am off to Apple tomorrow.

My Macbookpro 2012 won't turn on, stuck on grey screen, logo and loading bar

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