Help ! Screen grey on start up

Have tried all normal recommended routes - unplugging other devices etc. I can start with install disc to run repair, but that stops with
'Invalid key lenght' error and
'1 volume could not be repaired because of an error'
Any ideas ?
Thanks !

Chances are the HD has crashed, no forum can help on a hardware problem. Take it in for repair at your local Apple Store or Apple Authorized Service Provider (AASP). Use the AASP Locator link to find one in your area.

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