Another problem on another machine

My operating system has quit working.  I was running Ubuntu 9.10 and 
left it running while I went out.  When I returned it didn't work.  When 
I boot I get messages that it can't find /dev, /sys, /proc on root and 
/sbin/init not found. It also says try parsing init=bootarg but I have 
not idea how to do this.  I know this is rather vague description but I 
am hoping someone has seen this and know what to do.

Many thanks in advance to anybody who can give me an idea how to get 
this working again.

Jim
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