Please help! Grey screen on Macbook Pro 15"

Good morning to all!
Last night, suddenly my Macbook pro 15" shut down. When I tried to restart, I got just a grey screen.
I already tried all commands to recover my mac back, when a boot at single mode and use fsck I got a lot of errors. (I tried more than 15 times and still got errors!)
I tried to boot with my Snow Leopard DVD, but got a blue screen.
I'm thinking in buy a new hard drive to start a fresh new instalation. By the way, my OS is the new Maverick.
What should I do?
I appreciate any help!
Marcello Lima

The boot drive is failing, or there is some other hardware fault.
Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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9   libsystem_pthread.dylib       0x00007fff95c7a279 _pthread_start + 176
10 libsystem_pthread.dylib       0x00007fff95c784b1 thread_start + 13
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Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533641465238412D50422020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x112), Broadcom BCM43xx 1.0 (7.15.124.12.8)
Bluetooth: Version 4.3.0f10 14890, 3 services, 27 devices, 1 incoming serial ports
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