Deleted libsystem.B.dylib by mistake I deleted libsystem.B.dylib by mistake. On boot it got struck with Apple logo and a loading symbol below it. I tried booting with Cmd-v but it got struck with 

AppleIntelCPUPowerManagement: initialization complete
[HCIController][configurePM] power parent ready after 1 tries


and didn't process any further.

Any hints on how to get out of this are appreciated!
Roh oh. You'll need to find someone with a copy of it (what Mac have you got?), then copy it back over somehow, probably by mounting the drive with another machine, then cross your fingers and hope OS X plays nice with it. If not you'll need your system disks and do a clean install.