Macbook wont load!!! CMD+R doesnt work!

Hi!
I just tried updating to OSX Yosemite, however halfway through the installation the Mac displayed a notice stating "an error occurred" and restarted.
Since then i have been unable to boot up my macbook. If i try to boot normally it just gets stuck in a startup/shutdown loop, displaying some text suggesting kernel panic. If i hold down CMD+R, a prohibitory sign displays until i manually turn the macbook off.
I have tried:
Resetting PRAM,
Resetting SMC,
Starting in safe mode (will not boot),
Any help will be greatly appreciated!

Hi Makksta87,
If you are having an issue with being unable to start up your Mac and have been unable to boot to Recovery, you may need to boot to Internet Recovery. See this article -
OS X: About OS X Recovery
Note that an active Internet connection is required to do this. Also note -
Starting up from this system performs a quick test of your memory and hard drive to check for hardware issues.
Thanks for using Apple Support Communities.
Best,
Brett L

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