MacBook Pro is stuck at start-up screen.

I've only had my MacBook Pro for a week, and the problem started last night. Whenever I start my computer to OS X, it stops at the screen with the Apple logo and the spinning load icon. I've tried to hold down "C" during startup to activate the Install Disc, but it didn't work.
The funny thing is that, with Bootcamp, I can hold down the option key and start the MBP up in Windows no problem.
Can anybody please help me with a solution?

Run fsck.
1. Reboot/Startup holding your Command-S key down.
2. At the command line type the following and hit 'Return.'
/sbin/fsck -fy
3. After it has check/repaired your disk, type 'reboot' and hit 'Return' again.
-Bmer
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Try a Safe Boot: http://support.apple.com/kb/TS2570
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Hi daviscouch,
Thank you for using Apple Support Communities.
To troubleshoot this issue where your Mac will not boot past the gray screen with spinning gear, please follow the steps in the article below.
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I have read dozens of posts on this topic but none has helped yet.
My system has Windows 8 with UEFI. I want to install Windows 7 Pro on another partition. I have turned off Secure Boot in the UEFI/BIOS. When I try to install Windows 7 Pro from a DVD it shows "windows is loading files" and then gets stuck on "Starting Windows"
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I have already wasted many days on this. I hope someone can help.
Thanks!

Hi friends of the internet
I have been reading several forums regarding the issue of installing windows 7 (64 bit) to a computer that have had windows 8 installed previously or just a GPT formatted disk.
My Case:
Windows version installed: Windows 7 Professional N with Service Pack 1 (x64) or Windows 7 Professional (x64)
Computer used: Samsung laptop
Model Code: NP53U4C-A02SE
See the specks here:
http://www.samsung.com/dk/consumer/computer-peripherals/notebook/notebook/NP535U4C-A02SE-spec
Create a USB install disk that not freezes at ”starting windows” screen:
First I followed this great guide (Thanks Daniel):
http://
hodgin.ca/2012/10/02/creating-a-uefibios-windows-7-usb-and-installing-to-gpt-partitions/
STOP AFTER STEP 13!
1. Open a command line in administrator mode
2. run DISKPART
3. type LIST DISK
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5. type SELECT DISK # where # represents the number of your USB drive. Get this right or you will wipe a different drive out.
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(Let’s assume it’s drive E:)
Make a copy of your e:\efi\microsoft folder to e.g. your desktop.
Delete the e:\efi folder
Copy the \efi folder from a windows 8 installation disk (I used Windows 8 (x64) Professional) to the e:\efi folder. Sorry I cannot provide this for you.
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http://
hodgin.ca/2012/10/02/creating-a-uefibios-windows-7-usb-and-installing-to-gpt-partitions/
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www.sevenforums.com/tutorials/186875-uefi-unified-extensible-firmware-interface-install-windows-7-a.html
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Remember if we stand on each other’s shoulders we will reach higher
J.
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It's MacBook Pro . Model,ram,hard drive , I don't know , i get it from my friend . For some days . And suddenly I update it's software in Apple softwere update . And I forget to charge its battery . And it's goon to shut down when I charge it , that stucks on blue . Screen . and I also not have operating system disk.pls help

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Taking the computer to the Apple store.
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I don't think that will make a huge difference though,
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Data recovery before erasing.
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MacBook Pro is stuck at start-up screen.

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