Originally Posted by acid_kewpie
well you've not said anything about debug outputs and the likes, but the most common issue with PSK not working tends to be permissions on the files. If they are not set right they will not be used. make sure the files in ~/.ssh are set as 600 with ~/.ssh itself set as 700.
and if it is not permissions, please give us the output of
ssh -vvv <yourhost>
and maybe relevant (last login) entries from /var/log/auth.log