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How to fix an Old Single Push Button Toilet that won't stop flushing?

I live in a flat which has an old single push button flushing system with no visible cistern, i don't know what make or model (looks like some shopping mall toilets) but the problem is that it suddenly won't stop flushing unless the water is completely turned off at the tap, is there a DIY way to repair it?
Wardah, February 2009