TS3926 OS X Lion: Installer reports "This disk is locked"

Hi , I have a 2011 MBA with 256GB SSD and recently encounted a problem during start up:
1. Got gray screen with Apple logo and the running circle
2. Restart with Option key and ran disk utility.  Got "invalid sibling link"... Tried repair disk, cannot be repaired
3. Repeat restart with Option key and try to reinstall Lion.  But both Macintosh HD and Recovery HD indicates as "This disk is locked"
Please advise the steps I need to take to get my MBA up and running again... Thanks much.
Chop

I am also haing a same problem.
When I tried to first update Snow Leopard to Mountain Lion on an iMac, I was stuck at 36 mins reamining. Then I tried to reboot, that is also not possible.

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    Model Name: iMac
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      Processor Name: Intel Core 2 Duo
      Processor Speed: 2.4 GHz
      Number Of Processors: 1
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      Serial Number (system): QP*****X89
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    <Edited by Host>

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