I'm not sure if this is a troll post or I don't understand your question.
Get hard could be a few things - go hard as in crazy, high and dancing or get hard as in an erection.
MDMA is not used to get erections, and not normally a side effect from the drug.
If what you took was MDMA (did you test it) then if its not working within an hour/ 90 mins - it wasn't MDMA or you may be on other medication blocking its effect.