Why can't lion sea my startup disk

Whi is lion having truble finding my startup disk????
I inslalled lion when it came out da few weeks ago and it seemd to be running fine untill last week when it got querky, I decided to shut down and restart to give the OS time to think about what it had done wrong.  On restarty and a few times subsequently it could not find the startup disk, and had to be foced to retart 2 or three times and final would only find the sart up disk buy using an option restart... no good any thoughts?

See if its selected in ->Preferences->Startup Disk:

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