iMac 2008 boot problem

[Lumca]

Hi,

I have iMac 2008 and installed Mavericks on it. Recently i have installed update through Mac Store and since then when i boot iMac up.. I have grey bar with Apple logo on boot screen. When the grey bar is done iMac shuts down and when i boot it up again, the grey bar starts again.. i have tried SMC and PRAM reset. Nothing worked.

Do you have any solution?
Thanks for the answer

 

[Intell]

Have you tried starting it in Safe Boot by holding shift during boot?

 

[Lumca]

yes, still same thing.
Apple logo with running circle under it and grey bar.
Recovery mode is working (cmd +R)

 

[Intell]

Are you able to start it up in verbose boot by holding command-V at boot?

 

[Lumca]

This is happening when i am trying to..

 

[Intell]

Boot into recovery and use Disk Utility to repair the main partition.

 

[Lumca]

i doesn't work

 

[Intell]

Your hard drive's file system is coruppt. Your need to backup as many files as you can and then reinstall OS X.

 

[Lumca]

Well i have USB flash disk.. can i somehow backup from Recovery mode? Mount HD and copy files from it to USB?

Thanks

 

[Lumca]

bump
is there any way?