Why is the Mac HD icon missing in the Startup Disk window?

The Mac HD icon is missing in the Startup Disk window in the Lion Partition on my iMac. It is also missing from the Snow Leopard partition. I did not install Lion on my MacBook and the Mac HD icon is in the Startup Disk.
       Startup Disk (in Snow Leopard and Lion)
MacOSX, 10.6.8,             Mac OSX, 10.7,        Network Startup     (no MacOSX icon)
on Snow Leopard 1            on LIon 2
Any ideas about this?

I am currently in the same situation, and have Paragon installed on my Mac. Furthermore the Option key does not work when I try to hold it down during startup.

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Why is the Mac HD icon missing in the Startup Disk window?

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