fsck? ... unexpected consistency... ???

[contant]

trying running

fsck /dev/hda12

> I received the following error message while booting Linux 2.4.19 on 
> 2001 ibook.
> 
> /dev/hda12/ contains a file system with errors, check forced
> 
> ...
> 
> /dev/hda12: Unexpected Consistency; run fsck manually (i.e., without 
> -a or -p options
> 
> [FAILED]
> 
> what? how do i run fsck? i typed fsck and it prompts me to a line 
> but i dont know what to type.
> 
> thanks for any help.
> 
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