Maverick not booting, not even in safe mode

Mavericks was running smooth since release.
Yesterday I started having no sound with iTunes and GarageBand.
So I restarted but booting got stuck at the first grey apple screen with the spinning wheel.
I rebooted in recovery mode and repaired disk and disk permissions. Still no luck.
Rebooting in safe mode won't work either.
I do have rEFIt installed.
Thanks for help.
Paolo

I get "Problems sere encountered during repair of The partition map" when I ask Disk Utility to "Repair Disk" at the top level of the disk hierarchy (i.e. not on one of the partitions within the disk but on the disk itself). 
And: Error: Live file system repair si not supported.

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