ORA-03113: end-of-file on communication channel

All,  

I had an instance crash this morning and sence then have been getting an ORA-3113 whenever I try to open it. It will startup nomount and mount, the error occurs on the open. A search on metalink showed this was likely a shared memory error and recommended a reboot, which I have now done
(fortunately this is on a development server). I'm still getting the
ORA-3113.   Anybody seen anything like this and/or have any suggestions for getting the database to open?  

TIA,
John

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Author: John Weatherman
  INET: john.weatherman_at_replacements.com

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