Mac at Start up has a funny screen and you cannot use

It will not start up and it has a fuzzy screen and will go black sceen after

Try resetting SMC and NVRAP and then reboot.
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/PH4405
Try booting the Recovery Partition.  Power off, boot and then hold down the Command and R keys.  Is the screen still black?  If so it is not a software problem so take it in for diagnosis and repairs.  Make a Genius Bar reservation http://www.apple.com/retail/geniusbar/ or find an Apple Authorized Service Provider https://locate.apple.com/country .
If you are running Mavericks try upgrading to 10.9.2.  It has a fix for black screen problems.

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