If you can (if there isn't too much water in it already) try pouring really hot water in it (not on the sides tho) and let it sit for a few minutes... then use the plunger...That used to work with me... Now when in doubt, I hold down the handle when flushing just in case.. LOL
~ This Diamond now SHINES!! ;-p ~
My Sitch in MLC - http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Main=45253&Number=1901148#