Mysql table is marked as crashed and should be repaired

140312 13:43:54 [ERROR] /usr/libexec/mysqld: Table './***/phpbb_posts' is marked as crashed and should be repaired

Its mysqld.log in var/log

alot of messages, but before around hour i tried to "repaid table" from within phpmyadmin, but appears it has no effect.. why? How to fix?

I think "repair table" might work better.