Macbook not starting up

jeday

Registered
After getting a message to upgrade airport, quick time , security and another two things that I do not remember I got a message that upgrade was not done and restart the MB. I did the restart but when the sign MAC OS X starting up shows it freezes there for ever. I tried disk utility from the disk but it tells me that disk is OK needs no repair. Tried single user mode , the same, tried to reistall OS after first disk blue emty screen.
Safe mode not opening. Is there a way to get back my data ? and make the system work again?
 
What were you trying to upgrade to? What version of Mac OS X were you running before the upgrade attempt?
 
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