There's really no need to apologize. I just asked to confirm the reason of malfunction.
If you have /usr/lib/sw/libmysqlserver.so.2.0 installed, set APS_DB_DRIVER_LIBRARY parameter in /etc/psa/psa.conf to this path. You might also need to run # plesk sbin packagemng -sdf and # service sw-engine restart afterwards.
Otherwise your best bet is probably to follow the steps I detailed at the link I posted above.