Server Became Read Only System

I had a linux server (CentOs 5, mysql5, php5, directadmin). I had problems with apache few days ago, that's why i hire sys. admin who tweak the system (install the PAE kernel), and some more configurations, and during last 7-8 days server work w/o any downtime (before this server had 1-2 downtimes per day-> OOM killer.)

Now i had only ssh access (emails, directadmin access - give "wrong password" answer). As told my sys.admin It became read only system.

I cann't even reboot system

Quote:

[root@server sa]# reboot
reboot: /usr/local/lib/libpng12.so.0: no version information available (required by /usr/lib/libcairo.so.2)

such few commands work, the most commands that i know don't work

Quote:

[root@server ~]# ls -la
ls: error while loading shared libraries: libacl.so.1: cannot open shared object file: No such file or directory