MBP Loading Bar, gets to 20%, turns off

Hello guys,
I have a Late 2009 15" MacBook Pro running Mountain Lion (don't remeber up to which update). Last week, I was working on it in the morning and had it shut off and when I got to class it began loading from the screen with a bar under the apple logo. Once the bar gets to around 20-25% it stops, and the MBP suddenly turns off.
I have run disk ultitly in recovery mode and tried to repair Macintosh HD. Disk Utility says it cannot repair due to the drive being corrupt,  and instructs me to back up as much as possible and wipe the drive.
However, I don't have a very recent backup of my system (my fault) and to try to save my data, I had disk utility copy Macintosh HD onto an external hard drive.
When I load the MPB off of the external hard drive, the loading bar gets to 100%, but still turns off the endd.
Has anyone else had a similar issue? Is it a result of a hard drive fail or corruption? Is there any way to try and save the data before having the wipe the disk...?
Thank You!

Yes or the cable from the drive to the logic board has failed. That is common on the 2009 model. Many report of bad cables on that model year.
You can take the drive out of the system and connect it by USB and if it boots the computer then the drive is OK and the cable has failed. If it doesn't boot the system then it may be the drive or the cable and the bad cable corrupted the drive.
MARCIN2006 wrote:
Actually, as soon as I posted this message, my macbook sucessfully booted from my external hard drive...
Is this a sign that my internal hard drive on my MBP has failed?

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