Failed booting after the latest updating

Hello,

I am using Red Hat linux workstation 7.0. Unfortunately, after the last updating done yesterday (24-06-2015), the system failed to log-in after reading the file systems. It just hang up after reading the file systems. A forced switching off showing the message ' Cannot finalize remaining file systems and devices, giving up'. Please help me to figure out what happened with the latest updating.

Many thanks in advance

Regards
Aneesh