I updated Efi firmware, but force quit twitter to install. Now system won't come on, it just shows grey screen with the spinning wheel loading. I am running lion 10.7.3

I updated Efi firmware, but force quit twitter to install. Now system won't come on, it just shows grey screen with the spinning wheel loading. I am running lion 10.7.3.
Thank you

The following support article is somewhat outdated. Where it refers to booting from an installation disc, you should boot from your recovery partition (if running 10.7 or later) by holding down the key combination command-R at the chime.
Mac OS X: Gray screen appears during startup

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